This is the SilencerCo Bravo Piston Mount, which comes standard with the Hybrid 46.  This also has the same 1 3/8 x 24 (Bravo) thread pitch as the Yankee Hill R9 and Nitro N20.  So if you have either of those cans, this mount will allow you to run them (with a SilencerCo piston) on any of your traditional tilting-barrel pistols.  $99.95