The SRD22X 22LR can be used on both pistols and rifles and features a Grade 9 Titanium outer tube with 17-4 stainless steel baffles. Due to the durability of its materials the SRD22X can be used with .22LR pistols and rifles chambered in .17HMR/.17 Mach II and .22 Magnum. The SRD22X ships with a 1/2x 28tpi mount with an additional M9.75 mount available for purchase in the near future and is fully user-serviceable. – CALIBER 22 LR – MATERIAL Titanium – DIAMETER 1.0 in (25 mm) – OVERALL LENGTH 5.8 in (147 mm) – WEIGHT 5.1 oz (144 g) – ATTACHMENT TYPE Direct Thread