If the bolt lug interface is worn enough you can have what you think is fine go back off face within only a few shots. I had a Husky hammer gun that was loose and fixed it twice working just on the hook. The third time I addressed the bolt lock in addition to that and it is still on face after 6 years and was my primary target gun 2 years and the kid I sold it to hasn't babied it. All the parts of the system need to be right to keep it tight and functioning as designed.