An M16 or AR cannot fire out of battery for the simple fact that the firing pin cannot protrude forward enough unless the bolt is locked into the chamber. I have seen cutaway diagrams that clearly depict this. With other designs I am sure that it can happen.
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Originally Posted by 45K40
I concur on "the Bumpfire stock is gay and a waste of money". Bumpfiring is also a dangerous practice. Bumpfiring has different schemes or devices, but essentially allows the semi-auto weapon to shift back, preventing the bolt carrier group and fire control group from searing correctly . Where it gets scary is if the hammer follows thru, it can hold the firing pin forward. This may allow the primer to fire before the bolt locks (out-of-battery firing). Unlike advanced primer ignition (Uzi, for example) on a sub-gun, this is not safe for locking bolt systems. This is the reason for the disconnector in Full Auto weapons, to keep it from firing out of battery. YMMV, but I don't advise bump-firing. A $200 tax stamp is forever and a lot cheaper than wrecking a weapon or yourself,
45K40
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