Anyone out there shooting a 20P with a rifle length gas port KNOW what your gas port hole diameter is? I think mine is mis-drilled. Back story - I recently received a barrel back for the second time from a respected barrel manufacturer who will remain nameless, for now. I had to send this barrel back because the chamber was apparently mis-cut. I was having problems with including stuck bullets in the throat and short stroking the BCG . The shop said their reamer was the issue and they would order a new one, but insisted that the gas port dia. was correct for the smaller caliber. 2+ months later I get the same barrel back and while the chamber seems better, the gun is still short stroking. I've run 2 different powders up to book max and repeated with 2 different primers and the results are the same every time. It will kick the spent case but fail to pick up a new one. BTW - I've tried 2 different proven BCG, 2 diffent proven lowers, and 3 different proven magazines. I've made sure the gas port and block are lined up correctly and the gas key is not binding on the tube. This isn't my first rodeo with an AR but it is my first sub .224. Any help would be appriciated.