Colt Mfg Upper Receiver Conversion Kit 223 Remington/5.56 NATO 16.1 Bl. 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 for Colt Mfg LE6920CK Upper Receiver Conversion Kit 223 Remington/5.56 NATO 16.1" Bl: Manufacturer: Colt Caliber: 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 Magazine Included: No The Colt Mfg LE6920CK Upper Receiver Conversion Kit 223 Remington/5.56 NATO 16.1" Bl is a quality addition to the Colt lineup. For more great deals on AR15 Upper Receivers by Colt please browse our Colt Gun Parts page. What firearm models does the manufacturer say Colt Mfg LE6920CK Upper Receiver Conversion Kit 223 Remington/5.56 NATO 16.1" Bl is compatible with? The manufacturer suggests that Colt Mfg LE6920CK Upper Receiver Conversion Kit 223 Remington/5.56 NATO 16.1" Bl is compatible with AR-15