Multi-purpose compensator reduces muzzle climb, so you stay on target between shots during rapid fire engagements. Produces less concussion than most muzzle brakes for a smaller dust signature when shooting prone. California Legal Compensator is legal in all 50 states. BC1.0fit .223/5.56 rifles with ½ x 28 tpi muzzle threads. Mfg: Battle Comp Enterprises, Llc. SPECS: Machined 17-4 PH stainless steel with MIL-DTL 13924D Class IV black oxide finish, 1.0 available with a matte stainless finish.. All models include required crush washer and/or shims. 1.0 fit .223/5.56 barrels with ½"-28 tpi muzzle threads. 1.01¾" (4.5cm) OAL.