Colt LE6940CK AR-15 5.56 NATO 16.1" Upper Receiver Conversion Kit

The Colt LE6940CK is a complete 5.56 NATO upper receiver conversion kit built around a 16.1" barrel and Colt's proven direct-gas-impingement operating system. Drop this complete upper onto any mil-spec AR-15 lower receiver and you have an instant duty-grade carbine based on the factory LE6940 platform used by law enforcement agencies nationwide.

This conversion kit ships with the complete upper receiver assembly, an A2 front sight, a charging handle, a bolt carrier group, and a rear back-up iron sight. The barrel is finished in black and is chambered for both 5.56 NATO and .223 Remington, giving you the broadest ammunition flexibility in the AR-15 world. The included bolt carrier group and charging handle are matched to the upper for reliable function straight out of the box.

Derived from Colt's law enforcement LE6940 carbine, the LE6940CK upper brings the same duty-grade components found on factory Colt carbines to builders looking to assemble a complete patrol rifle from a registered lower. Whether you are a department armorer standardizing a fleet or a civilian building a faithful Colt service carbine, this upper delivers the rugged, no-nonsense reliability that has defined Colt AR-platform rifles for decades.