Developed and introduced in the late 1960s, the M203 was designed to act as an underbarrel attachment for a properly configured M16 rifle, allowing platoon-level grenadiers to provide support fire while still having a rifle ready and in-hand for self-defense and engaging targets where a grenade wouldn't be appropriate. Constructed chiefly from aluminum, the M203 has a forward-sliding rifled barrel with plastic grip sleeve, a safety switch inside the trigger guard, and a self-cocking single action mechanism. The maker's marks are on the left side of the frame, with the release catch for the barrel on the upper left. This example comes with a Knight's Armament stock rig, which includes a telescoping buttstock (maximum LOP about 13 1/2 inches), iron sights, triple rail mounting points, checkered pistol grip and a pair of quick-detach sling swivels. Also included is an aluminum sub-caliber insert that permits the firing of 12 gauge shells in the launcher, M16A1/A2 rifle length M203 grenadier heat shield with attached ladder sight, an extra M203 ladder sight, M203 quadrant sight (absent mounting screw) for mounting on a M16A1/A2 rifle carry handle, small hardware, and an olive drab green canvas web rifle sling.

Excellent, with 95% of the original matte black phosphate finish, showing some light wear and handling marks overall. The stock adapter is very good, with mild scuffs and dings. Mechanically excellent. NOTE: This Destructive Device is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479, National Firearms Act.