Would just like an opinion. I recently bought another Ruger 10/22 used. This one came in an aftermarket stock, along with the original. After 25 rounds the trigger pin drifted out and the gun stop working. I pushed the pin back in and it happened again. This time I put it back in the original stock. No issues. So I shimmed the aftermarket stock so the pin can't drift out. Put 150 rounds down range flawlessly. My concern is the pin shouldn't be drifting at all. Would anyone recommend changing the pin? is this a symptom of a potentially larger issue? Or am I encountering a normal 10/22 problem. Thanx!