BOLT CARRIER KEY STAKING One area to inspect, especially on a new AR, is the staking of the bolt carrier key. Failure to properly stake the key will result in serious malfunctions, due to gas loss, when the key loosens. A proper staking will physically displace metal on the key and ...
The BCG consists of a retaining pin, the firing pin, a bolt cam pin, a gas key, carrier, and bolt assembly. This unit will hammer the round, reload the new round, and expel the spent cartridge. The three functions are known as cycling, ejection, and reloading. The bolt carrier group,...
The gas key is mounted to the to top the bolt carrier with two screws. This is virtually never removed from the bolt carrier so the screws are staked into place. In the one below, you can see that one of the stakings was weak for the rear bolt. The next two photos are of the ga...