Colt M4 Conversion Kit, 5.56MM, 16.1" BBL MSR Upper Receiver Assembly, Matte Black

Colt Mfg LE6920CK Upper Receiver Conversion Kit 223 Remington/5.56 NATO 16.1" Bl - The Colt Conversion Kit contains the complete upper receiver group, including a charging handle, bolt carrier group, and back up sight. Conversion Kits are available in both the standard upper receiver with handguard configuration and Monolithic 1-piece upper receiver with free-floating barrel configuration. All barrels feature a 1/7 right hand twist. Now you can convert any Colt rifle to the most state of the art configurations.

Specifications:
Manufacturer:    Colt
Cartridge:    5.56x45mm NATO, .223 Remington
Barrel Length:    16.1 in
Barrel Twist Rate:    1-7
Finish:    Black
Color:    Black
Gun Model:    AR-15
Gun Make:    AR Platform