Forward Controls Design Flash Hider 9mm Luger 1/2x36 Nitride Black 9mm 1/2 x 36. At 2.063in long it's tiny compared to the 6315KM (2.4in). Though the 1/2 x 36 6315KM-S 9mm could be installed on a 223 AR its much abbreviated length and larger bore size (0.385in or 9.78mm) would mean reduced performance in the way of flash signature mitigation and muzzle rise compensation. Like 6315 on which it's based 6315KM-S 9mm has asymmetric ports to optimize muzzle rise compensation without creating obnoxious concussion and noise its 3 and 9 o'clock ports are slightly smaller and shorter the design forces more gas to be vented through the 3 upward facing ports. Compatible with Dead Air Silencers Key Micro 9mm sound suppressors. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 6315KM-S Flash Hider: Manufacturer: Forward Controls Design Color: Black Caliber: 9mm Luger Finish: Nitride Fabric/Material: 4140 Steel Threads per Inch: 1/2x36 Length: 2.063 in Weight: 3.55 oz Package Contents: Forward Controls Design 6315KM-S Flash Hider Single use packet of Rocksett Forward Controls Design 6315KM-S 9mm 1/2 x 36: 6315KM-S Flash Hider 9mm Luger 1/2x36 Nitride Black