Bit the bullet and bought a surefire SOCOM 7.62 mini. Put a couple rounds through it with a 18" 556 and as well as a couple 300 blackout with an 8" barrel at my dealers place. Not the quietest, but I'm also not sure the 220 factory ammo was subsonic out of my gun. 556 was loud but not unbearable. Will have to do additional testing when I have the time and get it chrony'd with some handloads. That being said, I am excited about having a compact little package.