Gallery: The AR-15 platform uses a series of gas rings on the bolt to properly insure reliable operation. How to check their condition? When is it necessary to replace them?
Franco Palamaro
The AR-15 platform Direct Gas Impingement system and the bolt's Gas rings
Franco Palamaro
The AR-15 bolt assembly. The gas rings are on the tail portion of the bolt
Franco Palamaro
The gas rings can be seen through the bleed off holes on the side of the bolt carrier group; contrary to popular belief, the gaps on the rings do not close completely even when new
Franco Palamaro
On the left, a brand new bolt assembly with pristine gas rings, on the right, a well worn bolt with rings that need to be replaced. The bolt has cycled in excess of 8000 rounds
Franco Palamaro
The bolt must not "fall" in and out of the bolt carrier group under its own weight when held vertically, either with the bolt facing upwards or downwards. If this happens, the gas rings must be replaced immediately
Franco Palamaro
Push the bolt all the way inside the bolt carrier group keeping it vertical...
Franco Palamaro
....and release it. This bolt badly needs its gas rings replaced
Franco Palamaro
A McFarland Coiled single piece gas ring next to a standard set of three gas rings mounted on an AR-15 bolt
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