The Advanced Armament Co Ti-RANT 9/9M (Non-HD) Piston, 1/2x36 allows the TI-RANT series suppressors to be used on a variety of host firearms with different barrel threads by quickly and easily swapping out the threaded A.S.A.P. piston in the rear of the silencer. AAC manufacture's the A.S.A.P. pistons to match the barrel threads of all popular factory threaded pistol barrels and many aftermarket barrels.