https://www.milsurps.com/images/impo...1HTJul13-1.jpg
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Looks like a 58mm or 6Pdr anti tank gun?
Which cannon was it that shared the ballistics of the Garand so the crews would mount one up next to the big gun to take siting shots?
Bob
Shades of the 106mm Recoilless Rifle!
I found this at The Havoc
"The M1 57 mm Anti-Tank Gun
The M1 is an almost exact copy of the British six-pounder anti-tank gun. The British design was first modified to American manufacturing practices and standards in order to produce the weapon for Great Britain under Lend-Lease. Production of the U.S. M1 anti-tank gun began in May 1941, and approximately 16,000 were made through 1945. The gun was light, easy to maneuver on the battlefield, and fired both armor-piercing ammunition and a high-explosive shell. Compared to American designed artillery, it had a horrendous recoil that was not popular with troops. The weapon was retired at the end of World War II."
Wiki
"The Ordnance Quick-Firing 6-pounder 7 cwt,[note 1] or just 6-pounder, was a British 57 mm gun, serving during the Second World War as a primary anti-tank gun of both the British and United States Army (as the 57 mm Gun M1)."