Not sure how recent this is, but I thought some of you guys might be interested in this:
Howell Arms who does the cartridge conversions for the old west black powder revolvers now offers some parts and services for Thompsons as well.
While it looks like they are mostly focusing on blank-firing parts for re-enactment, they also offer a Reduced Power or "EZ-Pull" spring kit for the semi-auto Thompsons.
Might be a good option for others looking to reduce the force needed to pull back the charging handle on their semi-auto Thompson.
I just got one for my Khar TM1 Thompson and it is a huge improvement over the springs that it comes with.
Link for those who are interested: https://www.howellar...omatic-thompson
Edited by MafiamanJ15, 28 May 2019 - 12:18 PM.