I`ve had my Marlin model 60 since I was a kid,put countless rounds through it and seldom bothered to clean it during the early years yet it never let me down. It always shot really well and almost never jammed,until a few years ago. It started doing it every 30-40 rounds then it got more frequent until it jammed almost every shot. I stripped it a few times and cleaned it really well,checked for wear or burrs etc. that might be causing the problem and didn`t find anything. Polished the feed ramp,no help. It jams the same way every time,the bolt comes front and slams into the side of the round being fed,pinning it to the ramp with 2 big dents in the side of the case. Sometimes it actually bends the round! I figured the carrier wasn`t lifting the rounds fast enough so I replaced the spring. This helped some,it only jammed every 5-6 rounds. Sigh. So I figured after so many rounds it could use a new recoil spring too. Changed it and now it`s back to jamming every shot! Doh. This gun is an old friend I`d really love to get shooting well again,any ideas? Marcus