M-1 is a semi-auto isn’t it?
You haven’t got my idea. Intermediate cartridge was alive and well before WWII.
It was Germans who first used it into a fully auto rifle making it any practical for the first time and it was Kalashnikov who made first standard issue assault rifle using that idea.
Fully auto weapons you mentioned were around for a long time.
Most of they aren’t actually a rifles.
Of course the intermediate cartridge was alive and well before WWII. The .30 Carbine cartridge is an example. So is the 7.92x33 used in the MP-43. Of course the M43 Soviet cartridge (7.62x39) would not be an example of a cartridge used before WWII. The Mannlicher Carcano and Swiss Mausers used a 6.5, the Marines used a Lee Rifle in 6mm about the time of the Boxer Rebellion. The Spanish Mauser used against the US in Cuba was 7mm.
The Soviet M43 Cartridge has a muzzle velocity of about 2300 feet per second. That is nearly the same as the US .30 Krag (aka .30/40)
The M-1 Carbine was fielded by the US and the Germans captured some of them in 1942.
Germany, fielded their first prototypes of MP-43 in 1943.
The M-2 Carbine is fully automatic. Looks like the M-1, just as the M-14 looks like Springfield Armory’s M-1A. Difference is the selector switch.