MasterPiece Arms MPA57DMG 57DMG: Masterpiece ArmsDEFENDER Series 57DMGa Cerakote Black finish a Side cocking Picatinny top rail design a Short lower receiver Picatinny rail a Low-profile mag release a Compatible w/both Promag & FN57 mags a Includes black combat muzzle brakeDEFENDER Series Common FEATURESa Semi-Auto a Improved hammer design w/spring-loaded disconnect a Fully machined 6061-T6 aluminum finger-grooved pistol grip & lower w/built-in QD flush cup for single point sling & stock attachment interface a Black \"Decal Grip\" panels a MasterPiece Arms Precision threaded barrel made in-house a Front & rear adjustable sights a Quick mag release a Made in the USA a Lifetime Warranty a Includes (1) polymer mag & gun case