The AAC Blackout Flash Hider is an extremely efficient design that effectively eliminates muzzle flash, even on short barrels. The open-end, 3-prong design of the Blackout is inherently stronger than 4-prong units, and is not subject to the wear and erosion commonly encountered with closed-end designs. All Blackout flash suppressors are machined from high strength aerospace stainless steel alloy and coated in a hard, durable, corrosion resistant SCARmor finish. This is the non suppressor mount version with no provision for mounting a silencer. Torque wrench is need for installation - approximately 20-30ft.-lbs.