Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese. 56x45mm NATO 14.5in Picatinny Upper Receiver. Developed using some of the most extremely sturdy and long lasting resources in existence these AR15 Upper Receivers by Colt will provide you with a product that will give you numerous years of stability. Colt has been making superior quality merchandise for a number of years and the Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver is their very own way of demonstrating exactly how much they are concerned. Here at OpticsPlanet we make it our responsibility to get the best product for all of your preferences and showcasing the Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver is something that we're happy to offer. Specifications for Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver: Manufacturer: Colt Caliber: 5.56x45mm NATO Barrel Length: 14.5 in Barrel Profile: Government Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 1/2x28 Muzzle Device: A2 Flash Hider Finish: Manganese Phosphate Color: Black Gun Model: M4 AR-15 M16 Fabric/Material: Aluminum Gun Rail: Quad Picatinny Gun Type: Rifle Gun Make: AR Platform Colt Bolt Carrier Group Included: MIL-SPEC Features of Colt LE6944P Upper Reciever Kit: Package Contents: Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver What firearm models does the manufacturer say Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver is compatible with? The manufacturer says that Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 14.5in Picatinny Upper Receiver is compatible with AR-15 M4 M16Colt LE6944PCK: Monolithic Piston AR-15 5.56x45mm NATO 14.5in Picatinny Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black