I tried this thread during downtime, I want facts then opinions , I ask this because I don"t know enough about them. I hope this thread isn"t a flop. :noidea: The Thompson had a .45 caliber pistol round, and usualy a 20 round clip, sometimes a 30, very rarely a 50 round clip. I once was at a museam and he asked me if I wanted to hold a Thompson I could not refuse, heavy gun,. I was also at a shooting range and this guy pulled up and asked me if I wanted to shoot a clip in semi-auto. I know very little about the PPSH so I asked this question, I know it had a 30 round clip and 71 round clip. EDIT. I have studied about both of them, and now no more about them.