Add the Colt legend of reliability to you rifle or build with these complete upper receivers from Colt. Built with standard AR-15 upper receivers with a 16.1 barrel chambered in 5.56 NATO with a 1-7 twist. Parts are finished in black. - Cartridge: 5.56 mm NATO - Finish: Black - Length: 16 - Style: Complete - Twist: 1-7 - Made in the USA
Determined at checkout.