Top of Receiver Nose Pin Punch Mark on M1 and M1928A1 TSMG's

[Rekraps]

15 hours ago, anjong-ni said:

To go back a few posts, is it really true that "all Thompson replacement barrels were test-fired"?

How? In a fixture?  Live ammo? Why? To burnish-them-in or something?

Manufacturing was pretty advanced at the time.

Making a lot of simple gun-barrels all exactly alike was easily accomplished by 1942.

Is it true that ALL 55,000 (in 3 years) Packard Merlins were assembled, run 8 hours, then stripped down to the last component and checked for perfection?

Seems like all this testing, if actually done... was slow and expensive. There was a war on...    Phil

I've seen oldie films of 1903 and Sten manufacturing plants and in each film (detailing the production process, B&W of course) the guns were test fired before packing for shipment. To me it would make sense that each replacement barrel for the Thompson would be test fired also. Perhaps they had a jig of some sort that enable the barrels to be fired without mounting on a receiver.