tl;dr --> Don't
We all know that one of the core features of AoS that other games lack is the ease of modding the game.
Why not let users take it up a notch by enabling them to modify the gun itself?
I suggest a weaponconfig file that could be edited with ease in notepad.
My suggested format
This would increase the freedom given to the users. You could increase the fire rate, but this would also increase recoil. You could increase damage but this would then decrease accuracy. Increasing the capacity of the weapon increases the reload time. Decreasing the capacity, on the other hand, decreases the reload time.
There are maximum values to prevent potential abuse (one-hit kill shotgun, wat?). For now, the default values will be minimum.
This should also decrease the number of people suggesting new weapons, since users can now taylor the three guns to suit their needs.
All the modifications you made to the gun will be client side, which means that the configuration will only take effect on your guns.
Feel free to ask any questions.