Colt Firearms have been known for generations. From the gun that won the west, to the pistol that fought and won 2 world wars, and the rifle that still serves the U.S Military. The Colt Expanse M4 is the latest addition to the Colt line of semi-auto rifles, by putting the bare bones of accessories Colt is able to bring down the price point to make a quality rifle affordable to more of the market. Unlike other rifles in the same price point as the Colt Expanse M4, you still get MilSpec quality like 7075-T6 aluminum receivers, 6-position telescoping stock. The Colt Expanse M4 223Rem/5.56Nato rifle features a flat top upper receiver, albeit without a rear sight which is ready to mount a flip up rear sight or your favorite red dot.