Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver Heavy Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black. 56x45mm NATO 11.5in M-LOK Upper Receiver was created to be the ideal product for anybody trying to find an outstanding selection.. These AR15 Upper Receivers from the skilled product professionals at Colt are made using long lasting and dependable materials as a way to provide you with product which is going to be effective for quite some time. Manufactured utilizing some of the most useful accessible components and construction these special AR15 Upper Receivers from the product specialists at Colt will last you an incredibly long time. Colt has been generating high-quality products for a number of years and the Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver is their manner of demonstrating just how much they are concerned. At OpticsPlanet we make it our obligation to get the most suitable solution for all your preferences and featuring the Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver is something that we are delighted to offer. Specifications for Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver: Manufacturer: Colt Caliber: 5.56x45mm NATO Barrel Length: 11.5 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 Commando Upper Reciever Kit: Package Contents: Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver What firearm models does the manufacturer say Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver is compatible with? The manufacturer says that Colt M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver is compatible with AR-15 M4 M16Colt CM556-11H-CK: M4 to M5 Carbine 5.56x45mm NATO 11.5in M-LOK Upper Receiver Heavy Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black