You might be getting a little confused. The STG-44 was the first assault rifle, meaning that it fired rifle rounds, not pistol rounds like the Thompson or MP-40. That is the difference between SMG's and Assault Rifles. The STG-44 fired 7.92mm rifle rounds, unlike the .45 cal pistol rounds used by the Thompson, or the 9mm pistol rounds of the MP-40. The STG-44 had a far heavier round than the Thompson, bit similarly it did kick like a mule.Platinum117 said:Apparently the MP44 was the first gun ever made entirely out of metal, although it was said to be far less effective than the Thompson counterpart because it fired small rounds that went incredibly fast which meant they punched right though a soldier but left a hole that was probably smaller than a pencil. The heavier slower rounds of the thompson expended all of their energy directly into the target causing crater sized wounds.Swollen Goat said:The German MP44. I'm not hugely knowledgeable about weapons, but my readings on WW2 tell me that was quite the sub-machine gun. Plus it's awesome in CoD!