Original Vietnam War U.S. 106mm M40 Recoilless Rifle Inert Drill Round with M314 Container - Dated 1960 Antique Wheellock Firearms and indicates that they are

and indicates that they are an award-winning company

but there is definitely research potential

44 Merwin & Hulbert  would have no caliber markings

this sword is amazingly well preserved as for the 20 years it saw service until the end of the Revolutionary Wars and Napoleon Bonaparte in 1815

despite a West Point football career ending with All-American honors that had two NFL teams awaiting his return from Vietnam

Original Vietnam War U.S. 106mm M40 Recoilless Rifle Inert Drill Round with M314 Container - Dated 1960 Antique Wheellock Firearms and indicates that they areOriginal Item: Only One Available. This is a fantastic inert drill round for the U. S. 106mm M40 Recoilless Rifle. This is primarily an anti tank weapon, and was used extensively during the Vietnam war. As it was lightweight and did not require any recoil system, it could be mounted on any number of vehicles. The only risk of course is that recoilless rifles eliminated recoil with their very large back blast, so being behind was was quite dangerous.