Hi, For several years I've been enjoying Merle's 22 conversions in the Thompson. I've had great success with the M1 and 1928 models. They would run all day long with failures being few and far between. Unfortunately, both of my kits with both of my Thompsons have stopped running. I've cleaned, switched ammo, changed recoil springs, changed lube, changed magazines, and still have the same type of jam. The jam - The round is stripped from the magazine and the nose of the bullet strikes the rear face of the barrel @ 2:00. The nose of the bullet is 1/2 inside the chamber and 1/2 outside the chamber. The jam happens several times/magazine. It has taken much of the fun out of the kits. Temporary relief (a magazine or so) from the problem can be gotten by removing and re-oiling the bolt. After a mag or two the jam is back. If anyone has seen this type of jam or can think of where to look, I would certainly appreciate some help. I'd bother Merle but I think the man deserves some rest at some point in his life. Sincerely, Grasshopper