BRK's New MF Moderators

I have it and it’s all that they say. Bet it stands for Mouse Fart vs MF.
Im running a huma mod 40 .25 cal mod on my sniper xr .22 which does ok, also tried a donnyfl fx mod, neither is nowhere near as quiet as my m3 .22 compact with any mod which is turned up higher. I tried adjusting the tune on the xr to see if it would quiet down but no change. Just wanting to see what works best on the sniper xr