The M3 Grease Gun was basically our version of the Sten which was partially inspired by the MP38/MP40-used of modern production techniques, stampings, pressings, etc.- procedures that could be quickly learned by at best semi-skilled labor. The M1 Carbine was originally intended to replace the pistol for support troops, people whose main function was to something else.
What has long interested me is how the M1 Carbine round has been limited to the M1 Carbine. In the Art of the Rifle section of this forum someone asked about a bolt action rifle in 30 M1 Carbine, the answer was none, the Marlin 62 is about the only other long gun chambering the round, Ruger chambered some Blackhawks for it, there was some AMT Automags, during WWII some S&W N-frames were chambered for it-and found unsatisfactory.
What has long interested me is how the M1 Carbine round has been limited to the M1 Carbine. In the Art of the Rifle section of this forum someone asked about a bolt action rifle in 30 M1 Carbine, the answer was none, the Marlin 62 is about the only other long gun chambering the round, Ruger chambered some Blackhawks for it, there was some AMT Automags, during WWII some S&W N-frames were chambered for it-and found unsatisfactory.