USED Forward Controls Design Flash Hider .223 Remington/5.56x45mm NATO 1/2x28 Nitride Black. 9in barrels compatible with .223 Dead Air sound suppressors with Keymo interface. 6315KM-L is 2.7" long and can bring a 13.9" barrel to non-NFA length (16.1in assuming 0.5in of threading on the barrel) Threaded for 1/2x28 precision machined from solid 4140 steel bar stock heat treated and QPQ coated it is probably the finest A2 style comp/flash suppressor ever produced. Its 3 and 9 o'clock ports are 25percent smaller (shorter and narrower) than the other three upward facing ports so more gas is vented through the upward facing ports it is a superior compensator to the A2 its flash suppression is equal to that of an A2. 6315KM-L is compatible with Dead Air 5.56mm sound suppressors. 6315KM-L is a light blended performance muzzle device. It provides 15percent to 20percent better muzzle rise compensation than the A2 and what is impressive is that it does so without sacrificing its flash suppression capabilities or creating more noise and concussion. Forward Controls Design is an authorized licensee of Dead Air suppressor mounts. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 6315KM-L Flash Hider: Manufacturer: Forward Controls Design Color: Black Caliber: 5.56x45mm NATO .223 Remington Finish: Nitride Fabric/Material: 4140 Steel Threads per Inch: 1/2x28 Length: 2.7 in Weight: 3.87 oz Package Contents: Forward Controls Design 6315KM-L Flash Hider Single use packet of Rocksett Forward Controls Design 6315KM-L: 6315KM-L Flash Hider .223 Remington/5.56x45mm NATO 1/2x28 Nitride Black