Not enough information. “Jamming” means what? Failure to feed? Failure to extract? Stovepipe? Have you tried firing with a different magazine or firing with just one round to see if it’s a magazine or feed ramp problem? Have you tried different brand ammo?
Failure to extract all of the way. No stovepipe. Haven’t tried different ammo, but will do that next. Gun is nearly new, even though vintage model.