In 1963 the AR-15 and M16 5.56mm automatic rifles "made Colt the small-arms sensation of modern warfare". Their unmatched accuracy, performance and durability are available in their direct descendent, the Colt semiautomatic-only, sporting rifles. They're ideal for hunting, plinking and competition shooting. This direct gas impingement upper assembly comes complete with Magpul adjustable flip-up rear sight, charging handle, bolt and bolt carrier assembly. Featuring a Picatinny-style Flattop, this upper is more than ready to offer the shooter maximum versatility when it comes to mounting accessories or optic devices. Notes: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.