Thursday, October 30, 2014

AR-15 Pistols

11.5" Barreled AR Pistol With SB15

The AR-15 weapon platform has been so successful for so long due to its modularity and adaptability.  It can be and is modified in a variety of configurations for a variety of applications.  Even during my brief service in the military, I was issued the weapon in various configurations:  from a  20" M16A2 during basic training to a 10.3" Mk 18 Mod 0 in my final unit.  As applications and mission specific requirements changed, so did aspects of the weapon.  One of the most dramatic alterations that can be made to the M16/AR-15 weapon platform is that of a "pistol" format.

Online forums and other media formats are filled with information (and opinions) on this variation of the AR-15, and it seems many individuals consider the AR-15 pistol to be impractical or worse.  In this blog post, I would like to briefly describe the AR pistol format, and then offer 2 applications in which it may be useful and worthy of consideration for adding to your armory.

Most AR-15 pistols will have a barrel length between 7-11.5 inches.  Like a short barreled rifle, modifications to gas port size are required to ensure reliable operation.  Typically, the AR pistol handguard consists of a smooth or railed free float tube that is obviously quite short in length (unless extending over the gas block).  Some models are configured with a standard front sight base, but due to the extremely short sight radius inherent in this design, most current AR pistols will have some other form of gas block and flip up front and rear sights or no sights at all.  In either situation, the AR-15 pistol can be more enjoyable and practical when a red-dot or holographic weapon optical sight is installed.

Sig Sauer SB15 Arm Brace

The AR-15 pistol is unique among pistols in its appearance and operation.  The standard AR gas impingement operating system necessitates a buffer and spring inside a buffer tube, and this is a detraction for some who might consider purchasing and using the weapon.  While it does increase the size of the weapon, the buffer tube can provide needed stability when braced against the forearm during use and the recent development of aftermarket parts like the Sig Sauer SB15 stabilizing arm brace turns this possible detraction into a potential benefit.  Other manufacturers  have chosen to use a piston operating system in their AR pistols eliminating the necessity of a buffer tube, buffer, and buffer spring completely.

An individual may read or hear many statements regarding the impracticality and even pointlessness of an AR-15 pistol.  I understand and agree with some of the arguments, but here are 2 reasons FOR purchasing and using an AR pistol:  I will define them as tactical and practical.

Tactical:  While this word is routinely overused and often misapplied, the AR-15 pistol can be tactically useful in some combat applications like vehicular operations.   In the tight confines of a vehicle, carbines and even SBRs can be unwieldy and awkward.  Yes, typical handguns can suffice, but few types of handgun ammunition can penetrate other barriers (vehicles, etc...) in the same manner as does a rifle round.  And yes, an SBR would be better yet-especially if the operation moves from inside to outside a vehicle; however, it is usually easier for civilians and even many law enforcement personnel to acquire an AR pistol than it is for them to acquire an SBR.  This specific but real and experientially proven application offers support for the benefit of the AR-15 pistol.

Practical:  One word-FUN.  AR pistols are FUN to shoot.  To segue from the previous argument for their benefit-it's both OK and practical to own a weapon in America simply because it provides enjoyment.  Let's not get so caught up in "tactical" that we forget that "sport" is a practical, valid, and legal reason for owning and using a firearm.

Del-Ton, Inc. is committed to offering AR-15 rifles and accessories in an environment where quality meets value.  We are working hard to increase our product line to include AR-15 pistol configurations and pistol parts in the near future.  Thanks for reading our blog.  If you have any questions about the AR-15 rifles we manufacture or the AR-15 platform parts we offer at, please feel free to contact us

Tuesday, September 30, 2014

The "Home Defense" AR-15

Many articles have been written on firearms in regard to home defense detailing the best choice of weapon in type, caliber, configuration, and probably a few other categories.  It is a popular topic, and one that is worthy of consideration so we will dedicate a blog post to the subject.  There may exist a better weapon (handgun, shotgun, etc...) for home defense for some particular applications, but DTI manufactures AR-15 rifles and markets AR-15 parts and accessories, so the information in this post will be limited to the AR-15 platform.

AR-15 Home Defense Considerations
The AR-15 rifle can be the best choice of firearm for your particular home defense application.  Rifles have the capability of neutralizing threats at a greater range than pistols or shotguns.  If the threat is a human being with the intent to cause you or others harm, this benefit needs to be weighed against possible negative consequences such as where each fired projectile goes when it leaves the weapon (collateral damage of any type), and whether the use of deadly force to defend you or others was  truly necessary at the distance the threat was engaged.  But threats are not limited to human beings with harmful intent.  If you live in a rural location, as I do, there may be non-human threats to humans and property.  The distance capability of a rifle may be a benefit that could make the AR-15 the best choice for a home defense firearm.  It all depends on your particular application. 

Another example of the AR-15 rifle being the best selection for your particular home defense needs is when it is your only weapon!  The considerations mentioned above in regard to using it in a home defense/deadly force scenario still need to be applied, but if it is your only weapon, or the best weapon in your limited inventory, then it is the right choice.  It is possible that some media professionals that have offered opinions on this topic have forgotten there are still many individuals who have a limited and thoroughly allocated income and may have a limited arsenal as a result.  Additionally, the substantial benefit the AR-15 platform has in being modular and easily configured for many applications is the very reason it may be the only weapon available to an individual for a home defense application.  The point of all this:  it is a fine choice for home defense, and it may be the best choice for home defense for a particular environment and application. 

AR-15 Home Defense Configurations
Any AR-15 can serve in a home defense role.  A rifle with a shorter barrel is definitely going to be easier to use in the confines of a building or in dense vegetation on your property, so this may be a consideration if you are in the market to purchase an AR-15 for this purpose.  A 16" barrel or a 14.5" barrel with a permanently attached muzzle device that makes the overall barrel length at least 16" is the minimum that you can own and use without going through the process of obtaining a SBR permit (short barreled rifle) from the federal government.  An AR-15 with a 16" barrel can work just fine as a home defense weapon.  Having a collapsible buttstock is also something to consider; it can reduce overall length to make the weapon easier to use in confined spaces and allow multiple possible users in your home to comfortably and accurately employ the weapon in this role.   

The AR-15's modularity benefit was mentioned earlier (modularity=designed for flexible arrangement and use).  In the past, there has been a trend to take this benefit to an unbeneficial end.  The AR-15 platform has more available accessory options than any other weapon system.  A railed handguard has a lot of "real-estate" that can tempt a user to fill every section with something that usually fits in one of 3 categories: necessary and helpful, potentially helpful, and "cool".  I urge you to resist this temptation and thoughtfully consider what you need for home defense (or apply this to any other application for which you may use the weapon).

For home defense, a light is a must.  It is very possible that a defense confrontation may occur in low light and you must be able to identify what is a threat and what is not.  There are many gun mounted light options that have function features such as "momentary on" and strobe effects.  These can be helpful features to have, but using them mandates training with them.  You need a gun mounted light for a home defense AR-15, but that doesn't mean you need a railed handguard.  Many standard, two-piece style handguards can have small  picatinny rail sections mounted on them in locations that best allow you access to manipulate the light.  Accessory rail sections can also be mounted to the front sight base or gas block or the light can be mounted to a vertical foregrip that is mounted to a rail section on a handguard.  An AR-15 designed for home defense use should not be a heavy, unwieldy weapon.  Get a light and keep it light, with only the necessary modifications and accessories.

There are many different options and accessories with which to configure a home defense AR-15; apart from a light, the only enhancement which I consider being near necessary is a red dot style optic.  Yes, iron sights can work just fine, but for quick target acquisition in most lighting conditions at most home defense distances, the red dot/reflex style of optic is hard to beat.  This type of optical sight is great for close quarters combat, and many brands are inexpensive--but therein lies a potential problem for their usefulness in a home defense application.  Anything, ANYTHING one may consider using for this role should be easy to use and dependable.  The red dot optics that are the least expensive tend to be the least dependable and least easy to use. Trijicon and Meprolight optics may be somewhat expensive, but need no batteries and have reticles powered by fiber optics and tritium (for use in very low or no light).  These are great choices for a home defense AR configuration and you never have to worry about their power source or turning the units on; however they tend to have fairly large reticles and may not be as bright as battery powered optics.  These characteristics can be a positive or negative feature, all depending on your preference and application.  The Aimpoint brand of red dot optics have a similar pricepoint, but they are battery powered. Like the Trijicon and Meprolight optics, they are simple and dependable, and are in use by law enforcement and military units worldwide.  Aimpoint's  ACET technology allows the optic to be left "on" for a couple of years before a battery change is necessary.  In any defense encounter where the use of deadly force may be necessary for your protection, fine motor skills have a tendency to not be so fine. Trying to find a power button, brightness level adjustment, and similar required adjustments can be difficult, so this feature is a real plus.  There are other quality optics that are less expensive, and some that may be equal or better that are more expensive; but, if you have the financial capability, Aimpoint optics are dependable, easy to use, and are worthwhile investment for a home defense AR-15 (and for many other AR-15 applications as well).

Many different online and print-media articles and reviews have presented information and perspectives on the use of an AR-15 rifle in a home defense application.  After reading/hearing the multitude of reasons why an AR-15 is not a good choice for this role (even vehement statements of why it should never be used in this role), it was my aim to offer some perspectives on why it may be, can be, or is a smart and valuable selection as a home defense firearm.  Thanks for reading our blog. If you have any questions about the DTI  AR-15 rifles we manufacture or the AR-15 parts we offer at, please feel free to contact us.

Thursday, July 31, 2014


As the author of this blog, I attempt to present objective information about things pertaining to the AR-15 weapon platform in general, and more specifically, the AR-15 related products we manufacture and market at  Sometimes, personal opinions or preferences may be revealed in the content; as with anything in any media form, the reader should approach the content with an open mind, but also with discernment.  I have been avoiding presenting the topic covered in this post, but from discussions I have had with other gun enthusiasts in my "community", it is something that may be beneficial...especially to those new to the shooting sports and the recent trend toward tactical weapons and equipment and their use.

Tactical? Yea, pretty much.
Two recent events spurred my motivation to dedicate a blog post to a topic about the adjective "tactical".  Last week I received a sales email from a great company that I have purchased many items from in the past (and will do so in the future).  Their email was to announce a new product:  a "tactical diaper bag".  Seriously.  What apparently made this product "tactical"  was the design features that included a lot of pockets, Velcro, and MOLLE webbing.  The product and the way it was advertised made me laugh (that was the purpose of the advertisement's description).  The second thing that gave me a desire to address this is the incredible amount of used AR-15 rifles for sale, almost all of them configured in an identical manner, listed on various online websites.  The sheer numbers of them and their low listed price caused me to consider the reason this may be happening.  I believe individuals purchase a weapon for less than ideal reasons for them and that this may prevent them from enjoying it and cause them to no longer see it as useful.  Both events lead me to believe that there exists a misunderstanding of what "tactical" truly means, and how it applies to equipment, education, and everyday life.

From an online used firearm sale website. A lot of "tactical" gear, but tactical? Not so much...

In previous blog posts, we have presented the concept that the most important thing to consider when deciding to purchase an AR-15 rifle or designing how you may want a custom model to be configured is your application (how you will use the weapon most of the time).  Some other authors and instructors call this concept philosophy of use.  For example, if you are going to use the weapon mostly for hunting, it should be built and function in a different manner than if it were to be used primarily for combat or personal defense.  The adjective tactical is defined in the Merriam Webster Dictionary as:  of, relating to, or used for a specific plan that is created to achieve a particular goal in war, politics, etc.  Can the term apply to hunting, target shooting, and other shooting sports not related to combat? Sure.  But currently, the equipment advertised as "tactical" is mostly existent as a result of and designed for combat related applications.  If combat/defense applications are not how you plan to use your weapon most of the time, it makes little sense to configure it with such features.  Even an AR-15 primarily designed and used for an application like hunting can be successfully employed as a defensive weapon.  If your main application is indeed related to combat/defense, use wisdom in selecting components and accessories that are truly useful for that application and its tactics (and not simply advertised as such).  In the fairly recent past, tactical accessories in purposeful use by our most elite military units included a light, a couple of zip ties, and electric tape-almost rudimentary in comparison to current "tactical necessities".  The individuals in these units were what was tactical, not the gear.  The point here is to design and use the weapon for YOUR tactics and application, not those of a friend, celebrity endorser/elite operator, and definitely not because it looks "cool".

Shooting is a perishable skill, and practice is essential.  There are many different opportunities to learn how to use your AR-15 rifle for your application.  It can even be beneficial to take a training class that doesn't relate to your application; the skills learned can easily transfer to improvements in your main use for your weapon.  In selecting a training course, make sure to research the quality of instruction/instructors, the content, and items listed by the instructors as required for successful participation.  It may be tactical carbine training course, but its not necessary to "gear up" as if it were an assault mission or an extended combat deployment.  Bring everything the instructors list as necessary, and most importantly, bring a teachable mind.  Nothing can prevent an individual and others in the class from learning like someone who knows everything already and is not prepared to listen and learn.  The class already has instructors, students are there to learn.

Everyday Life:
As evident by the earlier mentioned tactical baby bug-out bag, "tactical" gear is now apparently required for every facet of life.  From what I see at most local gun stores/gun shows/shooting ranges, it has also become a fashion trend.  Unless someone is employed in a military/LEO career field, being clad head to toe in "tactical" clothing and gear all the time doesn't make an individual look cool or credible-it honestly has the opposite effect.  Much like a person wearing a vest in the middle of summer for concealed carry handgun purposes, wearing "tactical" clothing and gear 24/7 is a non verbal, yet loud announcement to everyone regarding what that individual is all about.  Maybe that is the purpose? A deterrent? Maybe a statement of what the individual values and a desire to share it with everyone (like a clothing bumper sticker)?  I don't know.  I do know that my friends in law enforcement and elite military units don't wear "work" clothing when they are off duty.  They are normal human beings who want to be normal and also realize there is a definite and underestimated benefit to being "grey".  I have no desire to be critical or offensive-it's just my two cents; but I believe its worthy enough of consideration to spend a few hours writing about it. 

Whether it is in regard to the weapons and gear you may purchase and use or the education you receive from sources as varied as the internet to formal weapons/tactics training, it is important to realize: things don't make you tactical; you make things tactical

Thanks for reading our blog and any interest you may have in the AR-15 rifles we manufacture or parts we offer to enthusiasts of this weapon platform.  We would love to hear your thoughts on this topic or any of the other ones covered in previous blog posts.  Feel free to post comments on the blog, and if you have any questions about Del-Ton AR-15 rifles or parts, we would love for you to contact us.

Sunday, June 29, 2014

The "3-Gun" AR-15

Three gun (3-gun) competitions are one of the most currently popular shooting sports.  This particular sport requires the use of a handgun, shotgun, and a semi-automatic rifle.  Of all major shooting sports, this one offers the best opportunity to work on skills that can easily translate into other shooting applications.  The familiarity that the practice and competition provides the shooter with his/her weapon and its function will also benefit other applications.  There are various divisions with different restrictions on the types of weapons and accessories allowed for use, and more detailed information on the basics of 3-Gun competition can be found at this link.  DTI manufactures and sells AR-15 rifles and accessories, so we will use this blog post to highlight items in our product line that can provide a competitor with an outstanding weapon, specifically configured for this sport.

If you don't have a rifle to use in this sport, or don't want to alter your current AR-15 rifle, the DTI Evolution rifle model would be a perfect choice.  It is the top of the line rifle in our product line, and though it has just about everything a competitor would need in a 3-Gun specific rifle, it has an amazingly attractive pricepoint.  The 16" CMV, mid-length, lightweight, chrome lined barrel has accomplished sub-moa groups in a few different magazine reviews, and the Magpul CTR stock and Magpul MOE+ Grip allow for comfortable and confident handling. Also standard on this model is the DTI two-stage trigger, Sampson Evolution free-float handguard, and Sampson iron sights...this rifle will have you ready for competition right away.  

PRI Carbon Fiber FF Tube
If you have an AR-15 that you would rather modify for 3-Gun use, any needed parts can be found at  We offer a variety of lightweight, free float handguards such as the Yankee Hill Machine SLR, PRI Carbon Fiber Free-Float Tube, and Troy Alpha Rail that would be ideal choices for the speed and accuracy this sport requires. Optics and flip-up sight sets from major manufacturers like EoTech, TROY Industries, and Yankee Hill Machine are available to help the shooter acquire targets fast.  A quality trigger like the JP Enterprises AR-15 Adjustable trigger can provide smooth, confident, repeatable trigger manipulation.  Compensators and muzzle brakes will help you fight muzzle rise and stay on target or quickly acquire the next one.  Finally, reliable magazines are essential, and the Magpul PMAG is the industry standard for reliability.  The PMAG with windows can let the shooter know at a glance when the time is nearing for a reload.

DTI is committed to being the source for AR-15 products where quality and value meet.  We are also committed to the shooting sports and have sponsored individuals as well as 3-Gun matches.  Thanks for reading our blog.  If you have any questions about the AR-15 rifles we produce, the parts we sell, or need any assistance in building or setting up a 3-Gun rifle, please feel free to contact us.

Saturday, May 31, 2014

AR-15 Conversion Calibers: Basics For Safe Use

In our blog posts over the past couple of years, we have proposed that one of the greatest benefits and reasons for success of the AR-15 platform is its modularity.  With a few minor alterations, a rifle designed specifically for competitive shooting can be easily transformed into a weapon perfect for hunting or defense.  For the most part, the alterations we have mentioned have to do with peripheral parts, but the AR-15 even can even be converted to use different calibers. 

The most simple method of performing this "conversion" is to purchase an entire new complete upper assembly (and magazines if needed), and put this new upper assembly on to your AR-15 lower.  I may suggest that this is the safest way as well...but more on that later.  There are a variety of conversion calibers from which to select, but the most popular have been the 7.62X39, 6.8 SPC, 6.5 Grendel, and the .300 Blackout.  For training and shooting fun, rimfire caliber conversions are popular, but less so now that rimfire ammunition is more costly and difficult to acquire.  Much larger calibers like the .450 Bushmaster, .458 SOCOM, and .50 Beowulf are also options, but they have a very specific application and the same issues with ammunition cost and availability can affect the success or popularity of those calibers. 

5.56x45, 6.5 Grendel, 6.8 SPC, 450 Bushmaster

If purchasing a new complete upper assembly is not a cost effective option, one can disassemble their AR-15 upper and use many of the parts to build an upper in this new caliber.  For the 7.62X39, 6.8 SPC, 6.5 Grendel calibers mentioned,  a new BARREL (including muzzle device), BOLT, and MAGAZINE are  required.  The .450/.458/.50 offerings require a new barrel/muzzle device and bolt, but use the same magazine, albeit at a 60%+ drop in capacity.  In reality, the upper receiver, bolt carrier, gas tube, firing pin, etc...are the few parts that you can use for the new caliber.  If a new barrel/muzzle device, bolt, magazine (s), and possibly other parts (buffer) are required, I stand by the premise that losing a 5.56X45 complete upper assembly is not worth any cost savings that such a modification would provide.

We didn't skip the .300 Blackout, we saved it for last.  This relatively new caliber uses the same (though modified) case as the 5.56X45 cartridge and offers a promising .30 caliber bullet option in an AR-15 size package without using a different magazine.  It uses the standard AR-15 bolt and magazine, but a new barrel and muzzle device IS required.  Herein lies some risk for this particular caliber.  Because it uses the same magazine and bolt and only requires a new barrel and muzzle device, BAD mistakes can happen.  The .300 Blackout cartridge can be loaded into and fired in a 5.56X45 weapon, but SHOULD NOT BE. It will cause dangerous and potentially fatal results. Below is an image from such an event. Fortunately, the weapon was the only thing damaged.  Almost all other conversion calibers require a new bolt and barrel, and maybe a new magazine.  This particular one only requires a new barrel and muzzle device.  There have been a number of negative experiences resulting from an individual with misinformation attempting to use this caliber in a standard 5.56X45 chambered AR-15 or having weapons chambered in both calibers and a dangerous mix of ammunition and magazines. A magazine that you mark or specifically designated for ONLY one caliber is one way of helping to prevent a catastrophic failure of this nature, but an intent focus on safety is the only sure way to prevent dangerous situations when using firearms. 

.300 Blackout Bullet Lodged in 5.56X45 Chamber-cross section

Conversion calibers offer a definite benefit to many applications, but if not installed as a complete upper assembly or built on your current AR-15 platform and used with a focus on firearms safety, they do present a possible risk.  My wife bought a new hair dryer a while back.  It had an adhesive warning tag on the cord that stated in large font red lettering, "Not to be used in the shower" and "Not to be used while sleeping"...why were those warnings there?  Because someone had used them in such a manner.

This blog post was not designed to be a definitive guide on AR-15 conversion calibers.  The idea for and general purpose of it is to provide an online "adhesive warning tag" regarding conversion calibers and what you need for parts (at a minimum) to safely use them with your AR-15 rifle.  The internet can be an incredible source of free and valuable knowledge.  It can also contain information that lacks truth and is dangerous.  This is what led to the negative, conversion caliber related event described and displayed above.  The sheer volume of information online can be confusing, so when it comes to firearms safety, make sure the information is from a reliable source.  Research. A lot.

Thanks for reading our blog.  DTI carries some parts for conversion calibers with more being added soon.  Many of our current products exist because we listened to suggestions from our customers, so let us hear from you regarding what calibers in an AR platform you would like to see.  If you have any questions about the AR-15 rifles we manufacture or the parts we offer at, please feel free to contact us.    

Thursday, May 1, 2014

New Handguard Options

One of the most popular upgrades an individual tends to make to his AR-15 is some type of handguard with rails.  Having rail sections available so that mission specific accessories can be mounted is an important and maybe even necessary feature.

When handguard rail systems originated, they were fairly bulky items with a large diameter (usually a good bit larger than standard, two-piece, plastic handguards).  In the last couple of years, many manufacturers have begun to offer handguard rail systems in their product line that have a much more slim profile, with new design benefits like customized rail mounting locations, and a more comfortable exterior and profile for the shooter.  Rail sections can be positioned only where you need them, thus leaving the rest of the handguard in a more smooth, comfortable state for your support hand position (as opposed to the entire handguard being covered in rails and feeling like a cheese grater).

In this blog post, we will discuss a few of the handguards that we offer at that fall into this category.  Handguards like these have been standard, installed parts on some of our our earlier DTI TRX model and our current "flagship" model, the DTI Evolution.  We also offer these handguards as parts for those who would like to install them on their AR-15.  The models we will feature in this post are also all free floating, offering the opportunity for increased accuracy.

YHM SLR Carbine
Yankee Hill Machine (YHM) products have always been some of the most in demand offerings in our product line at Del-Ton.  Their new SLR (smooth, lightweight, railed) handguard comes in lengths suitable for any gas system length/setup and the thickness of the handguard's walls does a fair job at preventing heat transfer to the shooter's hand.  This is typically only a problem when firing at a high rate for an extended period of time, but some handguards of this style from other manufacturers have a more thin wall and heat can be felt more readily.  The thinner wall in those handguards may weigh a bit less and so there is always a "trade-off" (as in all options for your AR-15, your choice should be dependent on YOUR application).  Even so, the SLR is still a very lightweight option.

Troy VTAC Alpha Rail

Troy Alpha Rail
Del-Ton offers a couple of models from Troy Industries that have these features as well.  TheTroy VTAC Alpha Rail is available in various lengths for your particular gas system length and has long, oval vents.  These vents are the locations where Troy rail sections can me mounted according to your specific needs.  Comfortable ridges that run parallel to he handguard offer increased support hand grip  The Troy Alpha Rail is also available in a variety of lengths, but has round vents/rail mounting locations. There are two variations to this product, one has an integral, flip-up front sight built into the rail, one does not.  Troy Squid Grip inserts can be placed in the round vent holes to provide increased grip for the areas of the handguard where you do not desire to mount any of their rail sections for your accessories.

AR-15 parts and options are ever evolving and these products are worthy of consideration as upgrades to your rifle.  DTI is committed to providing AR parts that will help you employ and enjoy your rifle, and we're always looking to add innovative, quality parts to our product line to help you do just that.  Thanks for reading our blog. If you have any questions about the AR-15 rifles we produce at DTI or the parts we offer, please contact us.



Sunday, March 2, 2014

Sighting In With Iron Sights

So you got a new AR-15, and while you may have or will soon have an optic to use on it, you definitely want to make sure the BUIS (back-up iron sights) are ready for use in case you ever need to use them.  There are a few different methods to sight in iron sights for the AR-15.  Some of the methods are better than others depending on what type of BUIS you have as well as how you plan to use them (application).  In this blog post, we will offer one simple way to make sure an "A2" style iron sight set-up will be good to go for practical use on your AR-15.

Basic Information:
The rear sight of an A2 upper receiver or detachable carry handle is adjustable for windage and elevation.  Some styles of detachable or flip up rear sight are only adjustable for windage.  Most AR-15 rear sights have a "dual aperture" peep sight.  There is a larger aperture for short distance (marked 0-2 for 0-200 meters), and a smaller concave aperture for longer distances.

When using the short range, larger aperture, your elevation knob should be set at 8/3 for an A2 upper or 6/3 for a detachable carry handle sight on a flat top upper.  When your distance is beyond 200 meters, use the smaller aperture and set the elevation knob to the correct numeral for known distance: 8/3 or 6/3 for up to 300m, 4 for 400m, and so forth...8/3 would also be used for 800m.  You will notice there are positions in-between the numerals for fine tuning at distances in between the 100m settings.

All rear sights have a windage knob, usually on the right (ejection port) side of the weapon.  If you need to move your point of impact to the right, move the knob clockwise.  If your rounds fired are hitting to the right of point of aim, move the windage knob counter-clockwise.

To "zero" your rifle, you must have the front sight (elevation) and the rear sight (windage and elevation) adjusted so that you and your rifle can hit your point of aim at a given distance.  Here is one easy way...

Set your rear sight elevation knob to 8/3 or 6/3 and raise it (clockwise) one click.  This is the only elevation movement you should perform with the rear sight elevation adjustments during the sight in process.  All other elevation adjustments should be made with the front sight during the sight in process, and once the sights are zeroed, no further elevation adjustments should be made with the front sight (they should hereafter only be made with the rear sight).  For the zeroing sight in process, make sure you are using the small (long range) aperature on the rear sight.  Make sure that the rear sight aperture is in the middle of its adjustment range.  You will notice a small mark on the aperture that will correspond with a center mark on the rear sight base (this is known as a mechanical zero).  Check the front sight's mechanical zero by ensuring the base of the front sight pin is fairly level with the hole for it in the front sight base.

Using a 25 meter zeroing target, aim and fire at the target.  It is a good idea to fire at least 3 rounds and maybe more to be sure of where the bullet is impacting and control any variables that can be a result of improper technique that can occur with just one shot fired.  Take your time and use proper trigger manipulation.  Try to maintain the same cheek weld and sight picture for all three shots (avoid the temptation to disrupt your sight picture to view where your initial shots have impacted).  If the shots did not impact where you would like, measure the vertical and horizontal distance from the center of the "3 shot triangle" to the "bullseye". 

If the group of shots impacted high or low from point of aim, remember to only adjust the elevation on the front sight.  Moving the front sight clockwise will lower the sight and raise your point of impact, counter-clockwise will raise it, and lower your point of impact.  A front sight adjustment tool makes this a fast and easy process, but if you have something with which to depress the plunger on the muzzle side of the front sight pin, needlenose pliers can be used to change the elevation.  One "click" will move the point of impact 1/8" at 25 meters (or 1" at 100 meters).

If the group of shots impacted to the right or left of point of aim, move the rear sight windage knob.  All rear sights have a windage knob, usually on the right (ejection port) side of the weapon.  If you need to move your point of impact to the right, move the knob clockwise (the rear sight aperture will move to the right).  If your rounds fired are hitting to the right of point of aim, move the windage knob counter-clockwise (the aperture will move to the left).  Each "click" will move the point of impact 3/8" at 25 meters (or 1 3/8" at 100m).

Once you have calculated and performed the adjustments to the front sight (elevation) and the rear sight (windage), fire another group of shots and repeat these steps until point of impact matches point of aim.  When finished, move the elevation knob back to the 8/3 or 6/3 setting and flip the rear sight aperture back to the larger, short range aperture unless you will be firing at distances beyond 200 meters.

There are many different methods for setting what is known as a "battlesight zero"...this is a practical method for those whose shooting application is mostly related to personal defense or duty use.  The goal of this type of sight setting is to achieve acceptable battlefield hits from 25-250 meters (acceptable=target vital area hits).  While it is most accurate to do this at as long of a range as possible, adjusting your sights so that point of impact is 2.4 centimeters or just under 1" below point of aim at 25 meters will allow you to achieve a fairly accurate battlesight zero of this type, and place effective hits at the typical distances encountered.

Again, depending on your application (how you plan to use your weapon most of the time), weapon configuration, and range/distance availability, modifications to the suggested procedures in this post may be necessary; the method(s) described here are just one practical way to get your BUIS on target.

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