Why is Thomson called Chicago typewriter? How is its performance?

Thomson has a recoil delay, so it sounds like a typewriter. It often appears on the streets of Chicago, so it is called a Chicago typewriter. There are many models of Thomson submachine guns, but they usually fire the same kind of bullets, that is, the 45 ACP pistol. I believe all friends who have played chicken know this kind of bullet. In military pistols, the caliber of 45 ACP is relatively large, so the lethality is also one of the best in military pistols. However, the first condition for killing people is to hit the target. It's no use talking if you don't fight. Because the recoil of 45 ACP is greater than 9mm, the hit rate of the former is a little worse than that of the latter. Moreover, the butt design of Thomson submachine gun is not very good, and the straight butt design is not adopted, so the muzzle jump will be more serious when shooting, which will also affect the hit rate to a certain extent. Although the hit rate is low, the high firing rate and large-capacity drum make up for this shortcoming. Thomson submachine gun uses 100 large-capacity drum, which has strong firepower continuity and can basically destroy all enemies in the field of vision at close range. However, due to its high fraud, it was not fully distributed to the troops. Thomson's quotation at that time was too high, a gun was more than 200 dollars, while a Ford car was more than 400 dollars and an m 1903 Springfield rifle was more than 20 dollars. And Thomson's manufacturing is not as easy as his own M3 submachine gun. War costs money. The same performance, of course, everyone chooses the cheapest. Generally speaking, Thomson submachine gun belongs to a submachine gun with medium performance in World War II, and its accuracy is not as good as Finland's Su Mi submachine gun. As far as melee power is concerned, it is not as fast as the Soviet Bobosha. In terms of cost, it is not as cheap as M3 submachine guns made in Britain and China.