Originally Posted by Jackson
This gun is currently in my possession now. Last time I tried it out, I was having some major paint breaking issues. It looked to me like the breach section was milled a bit too big, allowing too much wiggle room for the stripper clips. I think this is leading to alignment issues with the barrel. I'm hoping I can shim the breach with some tape just to test it out, then possibly with JB weld as a more permanent fix. Maybe increase the chamfer on the breach of the barrel.
I've never had an SMG in my hands. However, before I did anything to the gun, I would put a caliper on the stripper clips and make sure they are the right width and not varied, especially if the marker worked fine before.