Original U.S. Vietnam War INERT Practice M31 HEAT Anti-Armor Rifle Grenade Trainer Dated 1964 - 66mm One-of-a-Kind and the three groove rifling

and the three groove rifling definitely stops about 12 inches from the muzzle

The brass fittings have mellowed to a very pleasing patinaed coloration as well

signifying its two members (Egypt and Syria)

The second fuse is painted green as shown but the paint is heavily worn

The 6th Marines was relegated to support the 3rd Brigade's attack from Limey to Thiaucourt

Original U.S. Vietnam War INERT Practice M31 HEAT Anti-Armor Rifle Grenade Trainer Dated 1964 - 66mm One-of-a-Kind and the three groove riflingOriginal Item: Only One Available. Totally inert and demilitarized according to BATF guidelines with hollow body and deactivated propulsive charge. This rifle grenade round cannot be converted to an explosive device, it is just a trainer. Not Available For Export The M31 HEAT is a fin stabilized anti tank rifle grenade designed in the late 1950s to replace the Belgian ENERGA rifle grenade which was adopted by the US Army and US Marines as an emergency