All KAC suppressor mounts are designed to work with at least one shim at 20 ft/lbs of torque with rocksett.
At least one shim should be used, even if you don't care about the orientation of the flash pattern or index pin.
The QDC MAMS drops a decibel or two when under a can in relation to a standard FH. Also reduces blast baffle wear. Pretty good brake, but if recoil reduction is the only concern, there are more economical high performers on the market.
I am not following on the criticism that they "blow carbon all over your gat" any more than any other brake.
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