A single Ti-RANT 45 series silencer can 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. We manufacture A.S.A.P. pistons to match the barrel threads of all popular factory threaded pistol barrels and many aftermarket barrels. All Ti-RANT series pistons feature heat treated stainless steel construction, a matte bead blasted finish, and engraving to identify the thread diameter, pitch, and direction of rotation for installation (Right or Left Hand threads). There is a “SHORT” model piston, designed only for use on 1911 pistols WITHOUT a full-length guide rod and on the FN FNP Tactical 45. And now, get a Ti-RANT 45 piston threaded in 1/2-28 or 13.5x1LH to use the Ti-RANT 45 on your 9mm host, or a 9/16×24 threaded piston for use on common .40 cal host pistols.