Colt AR-15 Upper Receiver Assembly 5.56x45mm 16″ Barrel

Cartridge
5.56x45mm NATO
Material
Aluminum
Style
M4 Polymer
Twist
1:7 Inches
Threads
1/2″-28
Barrel Contour
M4
Sights
Yes
Barrel Finish
Black Parkerized
Chrome Lined
Yes
Gas Block Diameter
0.75 Inches
Gas System Length
Carbine
M4 Feed Ramps
Yes
Upper Receiver Type
A3 Flat-Top
Barrel Material
Chrome Moly Vanadium Steel
Handguard
M4 Style Polymer
Bolt Carrier Assembly Included
Yes
Muzzle Device
A2 Flash Hider
Mil-Spec or Commercial
Mil-Spec
Compatible With
AR-15