Produced by Colt for the Federal Bureau of Investigation during their period of experimentation with the 10 MM Automatic cartridge, this pistol was returned to Colt after the Bureau was finished, and retained for historical value. Equipped with a set of 3-dot Trijicon night sight, the slide bears the standard markings with the two line address and "X" prefix experimental serial number on the right side of the frame. Grips are checkered plastic, with a polished trigger and serrated ring trigger. With the original box and factory letter, which confirms the features and status as a prototype weapon.