SilencerCo Bravo piston mount + 3 lug mount. This is what you need to run a 3 lug on a HUB 1.375x24 compatible supressor. You remove the end cap and spring from the piston mount and screw in the 3 lug mount into the empty piston mount. Comes with the wrench. Maybe a 150 rounds thru it. Text 713 8 zero 5 4945 or email thru TGT. Half the price of new and no tax.