Sig Sauer SRD22X Suppressor, 22LR/17HMR/22MAG, 6.2, Titanium, Black SRD22X 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 comes with a 1/2x 28tpi mount, with an available M9x.75 rear mount, and is fully user-serviceable.