
Originally Posted by
azoutdoorsman
The gas does indeed directly collide with the BCG, specifically the gas rings you mention, after it is routed through the carrier key and into the carrier itself. The system is not driven by the bolt carrier assembly, it is driven by the gases that impinge upon the bolt carrier assembly, which then move the carrier rearward, unlocking the bolt from the barrel extension via the can pin.
No. There is no collision with the carrier, or the ring. It's a chamber meant to expand as the volume of gas routed into it expand.
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