mmetalfan

No standard WH. In the smallarmsreview link, looks to be the bottom mag catch in the picture with the 3 types. I attached some pictures of the upper internals of the rifle. Does anyone have a good guide I can follow for taking out the parts of the lower such as the fire control and trigger etc?

Interesting you mention light primer strikes as I too was getting that before these current issues. Also what does PK stand for? Just finished reading. Excellent source of information. Probably a stupid question, but just to confirm, when he says GI parts, is he referring to parts that were used in the M1A1 thompson?

Will take a look and let you all know. Any good place you recommend for USGI parts? Also what parts would you recommend should be replaced?

Most of the time yes. Even with first one it may jam like this. I just retried it with 5 dummy rounds, and the 1st round on the right side of mag failed to feed like in the pictures. The 2 rounds on the left side jammed at a strange angle trying to go into the barrel and the last 2 on the right side feed correctly. I did not have my hand on the actuator during these tests. Just released the bolt and let the spring decompress on its own. Yup. It used to fire okayish a few months ago (just decided to finally look into this issue now due to other priorities). To me it looks like ammo sometimes has a hard time riding up that ramp that helps to guide the ammo up into the chamber/barrel. As for the barrel I have not replaced it. To my knowledge it is original. Not seeing markings near the last ring or anywhere visible on the barrel.

Hello I am a new Thompson owner and seem to be having feeding issues with both the stick mags and the drum. The results are always the same. Whenever the bolt pushes the round off a stick mag or drum, the round always seems to get stuck trying to feed into the barrel. I have attached pictures to show what happens (here I am using dummy rounds but the results are the same with live ammo). So far I have tried different stick mags and a different bolt with no luck. I am looking for guidance on what could be the issue. It used to be where I would have maybe 1 or 2 rounds jam like this, but now it is almost 99% of the time. This is a Thompson 1928 WH. Thank you