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How the HELL did he do that? I had ONE stuck in the barrel and when I fired the second, the damn thing EXPLODED out of the action. 9mm blowback will fry your face and pepper you with burnt crap. I'm surprised he was able to even launch a couple more after the first.
SMG? I still can't see it. My case was blown to bits and stuck in the action...
He told me it was on an M16 lower when it happened.
It was a 16" barrel so the pressure is pretty low at the muzzle.
It would be much worse out the back of the gun if this were an SMG barrel.
I cut the barrel back to 10.5" for him and he's probably still using it.