Colt LE6920EPRII-PRO 5.56 NATO 16.1" AR-15 Upper Receiver Kit

A complete Colt upper receiver kit in 5.56 NATO with a 16.1 inch barrel, cut to drop onto any mil spec AR-15 or M4 lower. Colt has been building this pattern for the military since before most of the aftermarket existed, and the LE6920 line is the civilian version of that same work. The fit between receiver and barrel extension is what you would expect from the company that wrote the specification everyone else copies.

This is the EPRII PRO configuration, and it comes with sights and a matte black finish. Pin it to a lower and you have a Colt rifle without paying for a second serialized receiver, which is the usual reason people buy an upper in the first place. A 16.1 inch barrel keeps it legal as a rifle build and keeps velocity where 5.56 wants to be. Nothing exotic here, just the pattern done right.