The SRD9 9mm pistol suppressor features a Grade 9 titanium tube and 17-4PH stainless steel baffles allowing for light weight and durability. The SRD9 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 SRD9 ships with both 1/2x 28tpi and M13.5x1mm LH pistons. Requires a Class 3/SOT for purchase