U.S. Army Ordnance Training and Heritage Center - This is an inert black, gold, and blue aluminum, and black rubber M31 HEAT practice rifle grenade used with the experimental T44 rifle by
Rifle Grenade M31 H.E.A.T Original Vietnam Era Restored Inert - Other Military Collectibles at GunBroker.com : 978849509
Early Air Force T.O. on Grenade Launching - AR15.COM
Original U.S. Vietnam War INERT Practice M31 HEAT Anti-Armor Rifle Gre – International Military Antiques