The Colt LE6920 EPRII PRO Upper Receiver Conversion Kit is a complete centerfire upper assembly chambered in 5.56mm NATO, updating Colt's iconic law enforcement M4 line with contemporary, duty-ready modular enhancements. This factory-assembled kit provides a drop-in option to convert any standard AR-15 lower receiver group into an Enhanced Patrol Rifle (EPR) Gen II PRO platform. It features a 16.1-inch chrome-lined carbon steel barrel with a 1:7" right-hand twist rate and a direct gas impingement system housed within an updated free-floating aluminum M-LOK handguard that completely isolates the barrel from hand pressure to maximize shot-to-shot accuracy. Upgrading from the standard base EPR assembly, the PRO package comes heavily configured with precision tactical components right out of the box, integrating a premium Radian Raptor ambidextrous charging handle and low-profile all-steel folding Magpul MBUS Pro iron sights. Colt LE6920EPRII-PRO 5.56mm 16.1" Bbl Sights Matte Black Upper Receiver Conversion Kit LE6920-EPRII-PRO-CK