SureFire SOCOM556-MINI4 Specifications Manufacturer: SureFire Model: SOCOM556-MINI4 Type: NFA – Silencer Caliber: 223 Rem / 5.56 NATO Construction: High-Temp Inconel Superalloy Coating: Cerakote Color: Dark Earth Overall Length: 5.5" Length Added to Weapon: 3" Diameter: 1.5" Attachment Method: Fast-Attach (Quick Detach) Factory Supplied Attachment: Yes Back Pressure Reduction: Approx. 60% Compatibility: SOCOM Fast-Attach Muzzle Devices Optimization: Flash – 10.3"+ Barrels / Sound – 14.5"+ Barrels Weight: 15 oz