How do I increase the durability of my gun?

To restore durability of your gun, repair it using the repair bench. However, every time you repair, its sturdiness will be reduced. More details about that topic here.

https://www.appgamer.com/lifeafter/strategy-guide/what-is-equipment-durability-and-sturdiness

Buy adding skill points to crafting gun skill or being a gunmaker profession from start your gun has more durability than other