I have a SPringfield TRP, that was my welcome home from Iraq present to myself. Rescently i the rear sight has started moving on my, after about 100 rounds, and i am wondering if this is something i can fix myself or should i cart it to a gun smith to repair? It appears that the set screw keeps loosning up, but i don't know if it is as simple as drilling a small hole to lock the set screw in place. any help would be appreceated.