Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese. 56x45mm NATO 16.1in Picatinny Upper Receiver was made to be the ideally suited item for anyone trying to find a top quality option.. Formulated by using several of the most extremely sturdy and long lasting materials around these AR15 Upper Receivers by Colt will provide you with an item which gives you many years of reliability. Colt has been generating high quality merchandise for a very long time and the Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver is their particular means of demonstrating exactly how much they are concerned. At OpticsPlanet we ensure that it is our obligation to obtain the best solution for all of your preferences and exhibiting the Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver is a thing that we're pleased to offer. Specifications for Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver: Manufacturer: Colt Caliber: 5.56x45mm NATO Overall Length: 24.5 in Barrel Length: 16.1 in Barrel Profile: Government Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 1/2x28 Handguard Type: Free-Float Muzzle Device: A2 Flash Hider Finish: Manganese Phosphate Color: Black Gun Model: M16 M4 AR-15 Fabric/Material: 7075-T6 Aluminum Handguard Style: Quad Rail Gun Rail: Quad Picatinny Gun Type: Rifle Gun Make: Colt AR Platform Gas System Type: Short-Stroke Piston Bolt Carrier Group Included: MIL-SPEC Magazine Included: No Features of Colt LE6940P Upper Reciever Kit: Package Contents: Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver What firearm models does the manufacturer say Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver is compatible with? The manufacturer says that Colt Monolithic Piston AR-15/M16/M4 5.56x45mm NATO 16.1in Picatinny Upper Receiver is compatible with AR-15 M4 M16Colt LE6940PCK: Monolithic Piston AR-15 5.56x45mm NATO 16.1in Picatinny Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black