But it does cycle correctly with other ammo? What ammo?
I wish you were closer and we could just swap parts around until we figured something out. This is on a pistol length system? Does it have the right size buffer? Like a rifle length in a carbine tube? I even had a carbine buffer once that was too long and had to trim some of the plastic off the tail of it. It sure does sound like the gas port in the barrel is too small.
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