Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black. 56x45mm NATO 16.1in M-LOK Upper Receiver then you have showed up at the ideal location.. Formulated by using several of the most strong and dependable materials in existence these AR15 Upper Receivers via Colt provides you with an item which will give numerous years of reliability. Colt has been developing high-quality products for a very long time and the Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver is their particular way of revealing how much they are concerned. Here at OpticsPlanet we make it our responsibility to obtain the perfect product for your requirements and exhibiting the Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver is something that we're happy to offer. Specifications for Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver: Manufacturer: Colt Caliber: 5.56x45mm NATO Overall Length: 32.5 in Barrel Length: 16.1 in Barrel Profile: M4 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: M4 M16 AR-15 Fabric/Material: Aluminum Attachment Type: M-LOK Picatinny Handguard Style: M-LOK w/ Top Picatinny Rail System Gun Rail: Picatinny M-LOK Gun Type: Rifle Gun Make: Colt AR Platform Flutes: No Features of Colt M4 to M5 Carbine Upper Reciever Kit: Package Contents: Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver What firearm models does the manufacturer say Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver is compatible with? The manufacturer suggests that Colt M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver is compatible with AR-15 M4 M16Colt CM556-16-CK: M4 to M5 Carbine 5.56x45mm NATO 16.1in M-LOK Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black