The silencerco blast shield is constructed of steel with a black finish.The silencerco asr blast shield attaches to any existing asr muzzle device including the single port asr muzzle brake.The asr blast shield reduces muzzle blast and concussion, and requires an asr muzzle device to mount to the host firearm.Choke Configuration: BlackCaliber Or Gauge: ASRLength: Blast ShieldModel: ASRSights: SteelFinish: BlackType: Blast Diverter