Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver Heavy Mid Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black. 56x45mm NATO 14.5in M-LOK Upper Receiver then you've come to the ideal location.. Formulated using several of the most extremely durable and long lasting substances around these AR15 Upper Receivers from Colt will present you with a product that gives you a great deal of reliability. Colt has been generating superior quality products for a number of years and the Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver is their particular approach to demonstrating exactly how much they are concerned. At OpticsPlanet we ensure that it is our obligation to receive the best solution for your specifications and exhibiting the Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver is a thing that we are happy to offer. Specifications for Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver: Manufacturer: Colt Caliber: 5.56x45mm NATO Barrel Length: 14.5 in Barrel Profile: Heavy 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 Handguard Style: M-LOK w/ Top Picatinny Rail System Gun Rail: M-LOK Picatinny Gun Type: Rifle Gun Make: Colt AR Platform Bolt Carrier Group Included: MIL-SPEC Features of Colt M4 to M5 Carbine Upper Reciever Kit: Package Contents: Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver What firearm models does the manufacturer say Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver is compatible with? The manufacturer suggests that Colt M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver is compatible with AR-15 M4 M16Colt CM556-14H-CK: M4 to M5 Carbine 5.56x45mm NATO 14.5in M-LOK Upper Receiver Heavy Mid Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black