SureFire SOCOM556-RC4 FDE Specifications Manufacturer: SureFire Model: SOCOM556-RC4 FDE Family: SOCOM Series Sound Silencer Type: NFA Silencer Item Group: Centerfire Rifle Silencers Caliber/Gauge: 223 Rem | 5.56 NATO Finish: Flat Dark Earth Cerakote Finish Type: Black Overall Length: 6.3" Attachment Method: Quick Detachable Diameter: 1.5" Construction: 100 Percent Inconel and High Temp Alloys Weight: 17 oz Back Pressure Reduction: 60 Percent Barrel Compatibility: Optimized for 10.3 Inches and Longer Mounting System: Fast Attach Tool Less Design Muzzle Device Compatibility: SF3P FH556RC WARCOMP Country of Manufacture: USA