ammunition weight a trifle, and accuracy is excellent. You can get a shooter up to speed on the .22 caliber rifle much faster than a centerfire rifle. But the .22 isn’t a center fire rifle and the power of the cartridge
Rock-Ola M1 Carbine: the original rock & roller and World War II allied small arms (If the M1 Thompson and Model 1911A1 .45 Auto incidents had not happened 8 years apart I'd think they were related.) Anyway, a replacement Thompson barrel wasn't much more expensive than a WWII vintage...