Sig Sauer SRD9 Suppressor 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. Sig Sauer SRD9 Suppressor Specifications: SKU SRD9 CALIBER 9mm Luger WEIGHT 9 oz (255 g) DIAMETER 1.38 in (35 mm) OVERALL LENGTH 7.2 in (183 mm) THREADS 1/2 in - 28 tpi & M13.5 x 1 mm LH ATTACHMENT TYPE Direct Thread MATERIAL Titanium / Stainless Steel