Colt AR-15 .223 Remington/5.56x45mm NATO 16in Upper Receiver M4 Carbine Length 1-7 1/2×28 Parkerized Black. Specifications for Colt AR-15 .223 Remington/5.56x45mm NATO 16in Upper Receiver: Manufacturer: Colt Caliber: .223 Remington 5.56x45mm NATO Barrel Length: 16 in Barrel Profile: M4 Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Finish: Parkerized Color: Black Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Features of Colt Complete Upper 223 Remington/5.56 NATO 16 Barrel Black MLOK Free Float Handguard: Upper Receiver Package Contents: Colt Complete Upper 223 Remington/5.56 NATO 16 Barrel Black MLOK Free Float Handguard What firearm models does the manufacturer say Colt AR-15 .223 Remington/5.56x45mm NATO 16in Upper Receiver is compatible with? The manufacturer suggests that Colt AR-15 .223 Remington/5.56x45mm NATO 16in Upper Receiver is compatible with AR-15Colt LE6920EPR-CK: AR-15 .223 Remington/5.56x45mm NATO 16in Upper Receiver M4 Carbine Length 1-7 1/2×28 Parkerized Black
Midwest Industries Upper Receiver Rod, Black Oxide 4140 Steel Tool for M4/M16 - MIURR Original price was: $125.95.$116.98Current price is: $116.98. 
OP Exclusive Moriarti AR-15 Upper Receiver 300 Blackout 10.5in Pistol Medium M-LOK 1-7 Twist 5/8x24 Thread Diamond Cut Free-Float Handguard Slanted Original price was: $399.95.$359.99Current price is: $359.99. 
Colt AR-15 .223 Remington/5.56x45mm NATO 16in Upper Receiver M4 Carbine Length 1-7 1/2×28 Parkerized Black
Original price was: $1,149.00.$1,079.00Current price is: $1,079.00.
