Please realize that is is hard to fix things over the phone but if I understand your problem and the gap is between the bottom of the action and the magazine then you have not gone deep enough with the barreled action. I realize you are limited because the stock is already contoured but you may have to go deeper and that will play heck with the inletting you thought was completed. Make a scraper yourself by grinding down an old power hacksaw blade. Go slow there is no hurry. Check it often. Good Luck!
