Original U.S. WWII and Korean War Inert 20mm M99 Training Practice Rounds Antique Shotguns however we did find many

however we did find many other mid 19th century examples marked like this on the lock

and front barrel band

Year of Manufacture: circa 1822-24

and tortured

Original U.S. WWII and Korean War Inert 20mm M99 Training Practice Rounds Antique Shotguns however we did find manyOriginal Items: VERY FEW Available. This is a wonderful opportunity to add one of the most collected calibers of ammunition, the 20mm. The 20 mm M99 TP cartridge is used for training, gun testing, and gull system function tests. It contains a hollow, inert projectile with a cavity for control. These rounds are all inert with deactivated primers and are in total compliance per the BATF regulations governing Ordnance. Unloaded or dummy grenades,