My measurements indicate that there isn't 1/4" available after bolt catch release before the BCG is fully back. If I've made some error, I certainly want to know about it.
ETA: Of course blowback carbines could be a different case, but they don't have bolt lugs.
Of course the buffer/BCG can bounce if it hits the back of the RE, making for a stronger strike on the bolt catch. I very roughly estimate this bounce as keeping 20% of the energy or 45% of the velocity.



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