The SRD45 .45AUTO pistol silencer by Sig Sauer features a Grade 9 titanium tube and 17-4PH stainless steel baffles allowing for lightweight and durability. The SRD45 features a booster for use with Browning Tilting Barrel type pistols. A fixed barrel spacer is also available for use with fixed-barrel hosts like the SIG MPX. The SRD45 ships with both .578-28tpi and M16x1mm LH pistons. The SRD45 can be converted to use with 9mm or .40AUTO host pistols by using the appropriate threaded accessory piston.