The M1A1 also had removable stock. I think may be also the M1921, M1927, pretty much all of them. The M1928 was issued early on in the war. It was also given in Lend Lease Act, so the Brits and Commonwalth had plenty of them too. I know the Alamo Scouts used them in the jungle without the stock for sure. I'd imagine Brit. Commandos may have found removing the stock for their missions useful but I don't actually know of an historic example nor seen photo proof.