There was a TV thing on the Johnson. A negative was the thin barrel, which could bend when used for bayonet application. Also, the bayonet affected reliability in feeding, because it was a short-recoil operation. Also, the rotary magazine defied regular maintenance procedures. Like a Savage 99, disassembly of the rotary magazine is only for gunsmiths
I read a book, "The Last Stand of Fox Company" about a company of Marines that had the first contact with the Chinese in the Korean War. This was in bitter winter. The book said that the M 1 Carbine wasn't loved because the rounds wouldn't penetrate well through the ice and frozen material of the Chinese. Head shots were recommended.
It's a very good book.
A great book and one of the most courageous stands in the history of warfare. For the most part Fox Company was made up of kids. The American kid can fight if he is properly led.