The Advanced Armament MK13-SD: The military-chosen Mk13-SD is an ultra-lightweight, fast-attach, high performance sound and flash suppressor engineered for bolt action rifles chambered in 300 Winchester Magnum and 7.62 x 51 mm. Grade 5 Titanium monolithic baffle core and Grade 9 Titanium tube give the Mk13-SD an improbable weight of 15 ounces, and the durability to withstand the 300 Win Mag muzzle pressures and temperatures Small size and light weight, it delivers greater sound reduction and accuracy than any similarly-sized competing model Does not include a mount.