Have a Marlin model 99 M1-cal .22LR, that I've owned over 40 years. Great little squirrel gun, but for a long time I've had ejection problems with it. Fired case get stuck in action sideways about every 4 or 5 rounds. A good cleaning does not help. Finally noticed wear on edge of metal lip that cartridge hits to be ejected. Wonder if taking a needle file to it to square it off would solve problem.
