Originally Posted by
tangolima
Wow. I haven't seen information this detailed. Thanks.
I would say primary extraction happens when unlocking completes at about 2.3ms mark. End of piston motion means primary extraction completed and the bolt travels with the bcg at the same speed. That happens at 2.5ms mark. The displacement difference is about 0.8mm, or 0.031", or 1/32". Energy needed is 20*0.031=0.6 lbf-inch for brass and 9.3 lbf-inch for steel. You are right. My estimate was off by factor of 2.
Energy loss to extraction is indeed insignificant except for steel cased ammo. Looks like adjustable gas block is way to go.
-TL
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