M1 57mm vs. QF-6 Pounder- Any Difference?

Well, when America entered the war (I'm pretty sure) they had no anti-tank weapon capable of taking on German armor single-handedly. The previous 37mm M3 was already obsolete , so they needed a good, capable weapon able to take on light and (possibly) medium tanks, even taking on worse if in larger numbers. Therefore they adopted the light British QF-6 Pounder, 57mm Anti-Tank gun. They adopted it for American service and renamed it the M1 57mm.

But I have one question: Was there any difference between the two, besides the operational name and the usage between the two countries? Was the American version upgraded to some specifications? I.E. Range, accuracy and velocity of the shell? Thanks in advance (I am writing about "The Tank of WWII" for my History class and I need to have a section on Anti-Tank guns, so that's why I need to know).

 

The carriage on the American version (license built) switched a shoulder pad traverse for a mechanical handwheel on early versions. Later they switched it back and called that the M1A2 which was the most produced version. I assume it was otherwise identical, and the M1A2 was identical. Better double check with someone else though if it's for a paper, I'm no formal expert.

It's possible the US version used a locally made carriage but I can't think of a split rail type appropriate for it already in production (which would suggest the British one was used, just the traverse mechanism initially altered).

 

US version had a US gunsight installed, but otherwise I believe they were identical. US 57mms didnt get any APDS ammunition though.