How tight a gun’s grips should be screwed on depends on a few variables such as the weight of the gun, how it will be used (target practice, carry, open/concealed carry, etc.), and the user’s individual preferences.
The most important things to keep in mind are that the grips should be tight enough so they don’t come loose during use and that they shouldn’t be so tight that they make the gun uncomfortable or difficult to grip. When in doubt, it’s always better to err on the side of too loose rather than too tight.
Some people like to use Locktite or another similar product to help keep their grips securely in place. This is particularly useful if you plan on carrying the gun or using it for self-defense, as you don’t want the grips coming loose at an inopportune moment.
If you do use Locktite or a similar product, be sure to follow the instructions carefully and allow plenty of time for the product to cure before using the gun. It’s also a good idea to test the grips out before relying on them in a real-world situation.
In general, it’s a good idea to check the tightness of your gun’s grips periodically, especially if you use the gun frequently or for demanding activities like self-defense. This will help ensure that the grips stay securely in place and don’t come loose at an inopportune moment.