I have had a Marlin 922M for several years. Great shooter. Just not 100% reliable due to magazine issues, I think. Recently, it is failing to extract the spent shell out of the chamber. I have deligently cleaned it, had a gunsmith clean it twice and still failure to extract. I have to use a small knife blade to PRY the casing out. I have tried 3 different brands of ammo. Still, no luck. Any ideas or help would be appreciated.