AR15/M16 Muzzle BrakeShorter version of the standard issue A2 birdcage muzzle deviceCompatible: AR15/M16/M4 w/ Standard 1/2x28 ThreadsFeatures: Heat TreatedErosion ResistantReduces Muzzle ClimbFinish: Black OxideMaterials: All Steel ConstructionLength: 1.75"N.W.(oz): 2.1