Hi Guys,
This is some of the info out there for the Thompson, they were issued to a lot of different units and I know that Tank and Armoured Reconnisance Troops in the 2nd Armored Division carried it in Normandy and elsewhere. I am not too sure about the level it was issued down to but I suspect it was issued mainly to Section Sergeants or maybe down to squad leaders. I also know that as it evolved the weapon became a lot less complicated so it would not have as many issues in the field. However it was over shadowded by the M3 Grease Gun which was cheaper to make and is very troop friendly in the field. We still used them (M-3) in the late 1980s on our tanks and mechanics APCs since it was easier to stow. We had a lot of fun on the range with those babies. I will see if any of my books have reference to the level this was issued too. I do know that my best friends father carried one in the pacific and swore it was the only reason he came home. He was a Forward Air and Naval Gun Fire Controller so he went ashore with the first wave on several islands and got a lot of practical experience with this weapon. I was not able to pry too many stories out of him before he died but the ones he did impart were very interesting. Anyway I hope this info helps.
Dave
The Thompson submachine gun, with a delayed blowback operation, was designed by General John T. Thompson in 1921. The M-1928A1 "Tommy Gun" was issued to armored and reconnaissance units. It was selective for semi- or fully-automatic fire. It fired the .45 cal. ACP cartridge in 20- or 30-round magazines, or a 50-round drum. It had a leaf with aperture notch battle sight. It's rate of fire was 600-725 spm.
The M-1928A1 had a removable buttstock. Most had a horizontal fore grip, but some had a vertical fore grip. The M-1928A1 was relatively heavy, and expensive in use of materials, machine time, and machine tools.
The M-1/M-1A1 was also a blowback submachine gun, selective for semi- or fully-automatic fire. It fired the same .45 cal. cartridge in 20- or 30-round magazines with a rate of fire of 700 cpm in full automatic mode. The gun was reliable, and continued to operate when similar weapons would have failed due to exposure to battle-field conditions. Production was 354,000 weapons.
The M-1 Thompson was a redesign of the model M-1928A1 to simplify production. The M-1 had a permanently attached buttstock and a spring-loaded firing pin like the M1928A1. The M-1 would not accept the M-1928A1 drum type magazine. The M-1 had a simple fixed aperture rear sight.
The M-1A1 differed from the M-1 only in having the firing pin machined into the face of the bolt. The M-1 and M-1A1 models of the Thompson were devised by Savage Arms.
The loading lever is in a horizontal position on the right side. The butt is fixed in place by two screws. The Thompson is 32 inches long and weighs 10 ¾ pounds. It has a muzzle velocity 920 fps (feet per second). The .45 cal ACP round gives the Thompson tremendous stopping power.
Paratroopers commonly used a 20-round magazine. By the time the M-1A1 was in production, the 30-round magazine was common. Manufactures of this weapon were Thompson, Colt and Savage. The USAF had a holster assembly for the Thompson.