Guards threads from damage and gives muzzle a finished look when compensator or flash hider isn’t installed. Precision turned on a CNC lathe from steel barstock, then given crisp, diamond-pattern knurling that makes it easy to tighten and loosen protector on barrel. Available to fit 1/2"-28. Mfg: Egw SPECS: Carbon steel, blued. 1/2"-28 – .650" (1.6cm) long, .810" (2.1cm) O.D.