Fostech AR-15 Strake Brake 5.56 Black Nitride. Holding true to this in aviation a strake is an aerodynamic surface generally mounted to the fuselage of an aircraft to improve flight characteristics. Specifications for Fostech AR-15 Strake Brake: Manufacturer: Fostech Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Barrel Material: 416R Stainless Steel Features of Fostech AR-15 Strake Brake Muzzle device designed to mitigate recoil and muzzle rise Package Contents: Fostech AR-15 Strake Brake What firearm models does the manufacturer say Fostech AR-15 Strake Brake is compatible with? The manufacturer suggests that Fostech AR-15 Strake Brake is compatible with AR-15Fostech 2503-BN-5.56: AR-15 Strake Brake 5.56 Black Nitride