The high-velocity gas will fill the chamber and force your BCG back into the buffer tube, compressing the buffer and buffer spring. Bolt carrier - The bolt carrier is the body of your BCG.When a round is fired through your barrel, gas is funneled back through the gas key and forced down into the body of your bolt carrier group. Carrier / gas key - Your gas key sits on the top of the BCG and connects to the gas tube. Your pin will then strike your round and fire your gun.
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