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.308 9mm 80% lower AR-10 AR-15 AR10 AR15 barrel BCG buffer kit Build kit BUIS buttstock carbine cerakote charging handle combo compensator complete upper foregrip free-float gas block glock gunsmith handguard iron sights keymod lower parts kit m-lok magpul mil-spec misc parts muzzle brake picatinny pistol pistol grip polymer80 quad rail RMR sights slide stock tools trigger upper