So.....Quite awhile ago I received a CIL 12g. pump, model 607 td series c, made in Montreal. The action was loose and the trigger would stick in the fired position, never fired it but it cycled Imperial ammo just fine. 4 years later I decided to see if I could fix it, even after hearing scary stories of how complicated they were. I took it apart, (everything but the trigger assembly, which I saw had a mis-aligned spring, so I fixed that to its proper position, and cleaned all with a toothbrush and solvent. Also I cleaned everything else.) Found out that is all that was wrong with it, as it locks up tight now and the trigger makes a nice crisp return. I had purchased some Federal #4 bird-shot some-time ago, and tried to cycle that through. It gets stuck in the feed tube, where the follower stop is. Shells go in, but don't come out. Still feeds Imperial no problem. So after examining the Federal shells, I realized the rim is a little deformed on 2 separate boxes, so not just one shell but all of them..... The only part of the shotgun I couldn't get apart was the feed tube off of the receiver, of course. I could strap it in a lathe and bore it a couple thousands of and inch if I could remove it. I haven't tried heat yet, as that is a last resort. If anyone knows how to remove the feed tube, your advice would be welcome. If not, then Thanks for reading this far.