I bought a Dirty 30 from Witt Machine and Tool. I am still waiting on a stamp to show up for it, though. I did screw it on my 270 and test drive it. Plenty quiet enough to shoot without hearing protection, and that is what I wanted it for, Hunting. Also wanted the short overall length since that rifle already has a 24 inch barrel on it. There may be some difference between it and my Silencerco Omega, but for the money I paid, I am happy with it.