Originally developed as part of the Special Purpose Individual Weapon program, the M203 has been a mainstay of American infantry for decades. Designed for compatibility with the 40mm rounds used by the M79, the M203 is primarily aluminum in construction, with a ribbed plastic grip cover on the sliding barrel, a safety switch inside the triggerguard, and a spring steel triggerguard that hooks on the magazine well of the host rifle. The mechanism is single action, cocking automatically as the barrel is closed, with a spring hook extractor for the spent casing. Two barrels are included, both with ribbed handguards, one 12 inches long and the other 9 1/4 inches long, the included upper handguard is short, and a Knight's Armament hinged front suspension band is installed.

Excellent, with 97% plus original matte black/gray phosphate finish, showing minor spotting and handling marks overall and mild oxidization on the breech face. 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.