I just purchased an older Marlin 39A Golden lever action, made in 1976. It is a pre-safety. I took it apart and it was clean, and I oiled it. My Wife and I fired around 75 rounds through it and it had 4 or 5 misfeeds where it jammed the lever open. I was able to shake out or "coax" the round in the chamber while I shook the rifle and worked the lever on these occasions. I was mostly using CCI mini-mags and a few winchester long rifle cartridges. I brought the gun home and cycled 60 rounds through it with 2 jams. The spring tension in the feed tube is much lighter than the spring tension in my tube fed Remington pump .22. Could that be the problem? I have also read that the cartridge stop can wear down. Any ideas?