So my Uncle dropped off a 1979 Browning Buck Mark a few weeks ago. Said it was having issues feeding and problems ejecting the magazine. The ammo he had was extremely old so I ran a magazine of S&W through it and it seem to function well. I took it apart cleaned it and the magazines real good. Now it seems to jam every couple of rounds. It tries to feed the next round but jams with the tip of the bullet starting to feed into the barrel. I thought about replacing the recoil spring but not sure where to start. Has anyone else experienced similar issues?