Geo
Assuming you have a padded or rubber recoil pad try cocking the gun and pushing the safety off so it is in the fire position. Then holding it by the barrels about 8 inches off of a carpeted floor release your grip and let it free fall to the floor and see if the safety goes on. When cutting the stock i assume you removed it from the action. Did you clean and oil any parts,did you tighten the screws to tight. What ever it is should be a simple problem to fix. Good Luck.