I have an older Ranger model Cooey 64. The original metal mag still functions fine. I purchased a new Savage 64 mag and it is causing failure to feed issues. First the feed ramp design is slightly different. 2nd. the front and back alignment catches ride slightly higher than the original. Is it a wear in issue? Or can I file the catch to match the original? or do I change the feed ramp angle? Looking for advice before I start re-inventing the wheel. Thanks in advance for any advice.