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But he’s not cycling supers with the block open and zero weights in the buffer. If the port is lined up there would have to be something weird going on. Could be there are no gas rings, wrong tube length, possibly the carrier and buffer spring binding. I’m a little concerned that the gun could be damaged with the hot loads and no weights. On the lock back, I had a problem with a receiver that was not relief cut properly and would not allow the bolt release to engage the bolt correctly. You could lock it back manually and bump lightly the gun and the bolt would slam closed. On tube length, take the upper off and turn it upside down. There will be a semicircle cut into the receiver that is meant for the carrier key to rotate into when the gun goes into battery. The gas tube should stop at about the 50% point (or a bit more) of the relief cut.
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