muscle tension
I am willing to bet that if you take an 870, load and fire it, and VERY consciously
put heavy pressure forward on the forearm, resisting same by drawing the stock and pistol grip rearward into the shoulder, that the bolt will not move a bit.
I believe that in the instances noted, the shooter is drawing the gun rearward with BOTH hands. At the shot, when the action unlocks, the slide comes rearward resultant of the shooters muscle tension as much as anything else.
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