What a coinkydink. I work in Anderson, IN and was talking to a woman in her 80s today. She said she worked on the Guide Lamp line during WWII making those pistols
They made this in Anderson too. Lots of stamped parts, went together fast compared to the Thompson.
http://www.rt66.com/~korteng/smallarms/grease.htm
The ones that made it into the hands of the resistance were greatly appreciated and another tool for them and it was much better than being completely unarmed.
Those that assembled them were doing a good thing...
One show said that after each British Commando raid on Norway, the armorers come in to collect the Thompsons ahead of the medical personnel.
I think the only machined part in the M3 "grease gun" was the bolt. It was also field convertible to fire the German 9mm MP40 ammo.
Back in the day, early 1970s, my (8th grade?) class took a tour of the FBI building in DC. An agent fired off a drum on the Thompson, and handed out the spent casings as souvenirs. Yes, they had an enclosed/soundproofed/bullet proof glassed firing range in the building to show off.