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What issues or symptoms are you having?
I have yet to see an M92 that actually wasn't getting enough gas to cycle.
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+ Neither have I. I think FX hummel ran a TR class with 4000rds, with a messed up gun, and it ran good with either no brake, and or the cone booster. The cone booster IMO puts the most pressure back through the gas system, as noted by the BCG hitting the rear of the gun harder..
RNB32 what ammo are you using, and when is it having troubles cycling?