The SRD9 9mm Pistol Silencer 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 Titling Barrel" type pistols. A fixed barrel spacer is also available. The SRD9 ships with both 1/2”x 28tpi and M13.5x1mm LH pistons.