I have an LMT 10.5" and had a Noveske 10.5". I run/ran them suppressed quite a bit and typically with 855or 193 and occasionally with TAP and TSX. My LMT runs well with an H or H2 buffer and the Noveske better with the H2. But, the Noveske seemed more finicky when suppressed, possibly due to the slightly larger gas port, but I really shouldn't speculate.
Now, I noticed both were much more consistent with ammo (very rarely I'd run Wolf or Brown Bear) and whether it was suppressed or not when I switched the receiver extension the the Vltor A5. I would typically always have a new carbine action spring and a second buffer in my bag with these uppers. With the A5, I don't worry about it and the rifle action spring lasts a good bit longer.
I'm not telling you to run out and buy the A5, but it did make my 10.5" uppers as reliable as my 14.5" and 16" rifles and also made it feel more consistent. With the carbine RE, I often felt that I was on the edge of failure when I changed any one thing, but with the A5, it always feels strong and consistent.
I wish I could diagnose your problem, but without seeing the rifle and testing one thing at a time as IG said, I really don't know. Good luck man.
Proven combat techniques may not be flashy and may require a bit more physical effort on the part of the shooter. Further, they may not win competition matches, but they will help ensure your survival in a shooting or gunfight on the street. ~ Paul Howe
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