the Thompson, the M1A1 version in particular, is one of the few military weapons for which the factory stock is too long for me. It's a two-minute job with a screwdriver to change the butt out on an M1/ M1A1, so I've often had one with about an inch and a quarter off it and the buttplate trimmed to swap out when needed. The M1928 with its pushbutton butt release is even quicker.
On the other hand, the poor Vietnamese who got the things in the 1960s found even that too long, and usually just pitched the buttstock altogether. And that was how we very often came across the things there.
