|DTI rifle buried during "torture-test"|
When loading a magazine into the magazine well of the rifle, be sure to firmly insert it. You don't have to wail on it like crazy...but after inserting it, a firm tap on the bottom of the magazine with your palm will ensure that it is in the proper place for reliable feeding. It's not a good idea to hold the weapon with your support hand in a manner that allows your hand to contact the magazine or to use the magazine as a "monopod" (allow it to firmly touch a hard surface such as the ground or a bench while shooting). This pressure can cause the magazine to rock into a position that can cause feeding issues. That is one reason why a grip like the one pictured below can be problematic (in the photo below, the LEO is restrained by his current environment and application from using an extended grip) and why the extended arm support hand grip where the weapon is held much further toward the muzzle by the support hand is a better idea. It also offers the benefit of increased control/rapid target acquisition.
When loading a round into the chamber from the magazine with a closed bolt (using the charging handle), make sure not to "ride" the charging handle forward when releasing it. This can cause the ammunition to cant and have a more difficult time chambering properly. Pull the charging handle back, and let it go (of course while keeping standard firearms safety rules-muzzle on target/finger outside of the trigger guard). There is a forward assist on most modern AR-15 rifles. You shouldn't have to use it. This feature is nice for a weapon that has a heavily fouled bolt and chamber due to extended battle use, but its use should not be necessary for the average owner of a clean AR-15.
So you have a round in the chamber and have pulled the trigger, but there is a failure to fire. What now? Keep the weapon pointed in a safe direction and after waiting for a minute or two (due to the very rare chance there is a delay in the primer igniting the powder) attempt to extract the round using the charging handle to move the bolt and carrier assembly rearward. It could be a bad primer in the ammunition. It could be bad ammunition. It could be caused by accidentally forgetting to install a firing pin after cleaning the bolt and carrier assembly. Inspecting the bolt to make sure all parts are installed correctly and lower receiver parts are correctly installed and functioning properly should be your first course of action once the round is extracted.
Cycling issues (failure to extract/feed), are typically caused by an issue with the gas system. It may be that there is not enough gas pressure produced by the fired ammunition and bad ammo is the problem, but cycling issues can also be a result of failures in the parts of the gas system. A clogged gas tube, an improperly installed gas tube or gas block, a broken extractor or ejector, damaged gas rings on the bolt, a leak around the carrier key or past the bolt...even parts modified from the original design can cause these type of malfunctions.
Whenever modifications to the original design of the weapon are performed (or even disassembly, reassembly, or new installation) be sure to check and double check that things are in the correct place. One example of a modification that could cause cycling problems might be using a new upper assembly with a different gas system than the one that was originally on your weapon (a dissipator-style gas system or those on a short barreled rifle may require that you modify other parts of the entire weapon system to ensure reliable functioning, especially with a particular type of ammunition). The changes in gas pressure and timing from various lengths of gas systems may not work as well with heavy buffers in the stock or a heavier bolt carrier. Just some things to consider if you have made modifications and suddenly experience functioning issues. Here is a link to a previous blog post that gives basic information about the various gas systems used in the AR-15 weapon platform: http://blog.del-ton.com/2012/01/ar-15-gas-sytems-and-operation.html. As stated earlier, even something like normal disassembly for cleaning and maintenance can cause problems if parts are not reassembled correctly. For instance, make sure the gaps in each individual gas ring on the bolt do not line up together after they are removed and replaced or moved during cleaning.
At DTI, each and every rifle and upper receiver assembly is test fired to ensure reliable functioning and inspected before it is sent to our shipping department and on to the consumer. Each and every one. If there is ever an issue with how your DTI AR-15 is functioning, we will do our best to remedy the situation as quickly as possible. This post mentioned a few simple, suggested things to consider before contacting us. However, if you have any questions about your weapon malfunctioning or need assistance, please contact us. That is why we are here. That is why factory built Del-Ton rifles have a limited, lifetime warranty to the original owner. We stand behind our products.
Thanks for reading our blog. If you have any questions about Del-Ton rifles or the parts we sell at www.del-ton.com, please contact us.