It might be overgassed if it's a midlength system. My suggestion is to try an adjustable gas block.
I've used the PRI gas block on two different 18" midlength barrels. I shut the system off, then backed the screw out one quarter of one turn. Both run great now.
Buffers, springs, different weight carriers, etc work fine for tuning a setup that's already close to ideal. But they simply treat the symptoms if the problems are severe.
I've used the PRI gas block on two different 18" midlength barrels. I shut the system off, then backed the screw out one quarter of one turn. Both run great now.
Buffers, springs, different weight carriers, etc work fine for tuning a setup that's already close to ideal. But they simply treat the symptoms if the problems are severe.
Drifter

