Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider. 56x45mm NATO 16.1in M-LOK Upper Receiver was developed in order to function as the ideally suited product for any person trying to find a top quality option.. Formulated using some of the very most sturdy and dependable components available these AR15 Upper Receivers via Colt will present you with something that will give you numerous years of consistency. Colt has been generating high quality merchandise for a very long time and the Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver is their way of showing you exactly how much they care. At OpticsPlanet we ensure that it is our responsibility to obtain the perfect solution for all of your specifications and showcasing the Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver is something that we're happy to offer. Specifications for Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK 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: Aluminum Handguard Style: M-LOK w/ Top Picatinny Rail System Gun Rail: Picatinny M-LOK Gun Type: Rifle Gun Make: AR Platform Colt Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Magazine Included: No Features of Colt LE6920EPRII Upper Reciever Kit: Package Contents: Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver What firearm models does the manufacturer say Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver is compatible with? The manufacturer suggests that Colt Enhanced Patrol Rifle II AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver is compatible with AR-15 M4 M16Colt LE6920-EPRII-CK: Enhanced Patrol Rifle II AR-15 5.56x45mm NATO 16.1in M-LOK Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black