The Colt LE6933 EPRII Upper Receiver Conversion Kit is a complete centerfire upper assembly chambered in 5.56mm NATO, updating Colt's legendary short-barreled Commando line with contemporary, duty-grade tactical enhancements. This factory-assembled kit provides a direct, plug-and-play solution to convert any standard AR-15 lower receiver group into an Enhanced Patrol Rifle (EPR) Gen II short-barreled platform. It features a compact 11.5-inch chrome-lined, button-rifled premium carbon steel barrel with a 1:7" right-hand twist rate and a direct gas impingement system housed within a 10.5-inch free-floating aluminum M-LOK handguard that completely isolates the barrel from hand pressure to maximize shot-to-shot accuracy. The defensive configuration is rounded out right out of the box with an ambidextrous manual safety selector barrel part, a mil-spec full-auto profile bolt carrier group, and low-profile folding Magpul MBUS 3 adjustable sights. Colt LE6933EPRII 5.56mm 11.5" Bbl Sights Matte Black Upper Receiver Conversion Kit LE6933-EPRII-CK