The AR 15 mainly runs of two different varieties of the systems of gas. The two techniques are:
1. Direct impingement (DI).
The most common and the original type of gas system design in the ar 15 is the DI form of the gas system. The piston form of the gas systems are relatively newer and had been recently introduced with the advancement in technology. There had been a lot of disadvantages relating to the piston designs earlier but the latest designs of the pistons as the AR 15 parts has gained much familiarity in today’s world.
The advantages relating to the AR 15 gas chambers:
• The system for execution is way cleaner with limited fouling of the chambers in BCG and relatively greater amount of fouling from the blocks of the gas or the exhaust.
• The reliability is way much stronger in the shooting conditions of adverse nature.
• The cleaner procedure is way much easier as the removal of the hand-guards is not mandatory.
The disadvantages of piston type gas chambers:
• The cost of the piston setup is more compared to that of the DI gas system.
• The piston type is much heavier as compared to the DI type.
• The recoiling impulse is harsher.
• The accuracy of the piston type is comparatively less.
• The time difference from one shoot to other is way more in the piston gas chamber type ammunition.
• The cost is much more, with the toughness for part replacements and additional parts.
The reliability towards the harsher environment becomes very limited with the piston type gas chambers and mainly when the type of the carbines used in the rifles are of the non-precision types. The cost relating to all the parts of the AR 15 ammunition is more or less the same.