This mod function is to add (not replace) weapon. The list of custom weapon is :
1. M4A1 Beast
2. M4A1 Beast Gold
3. PKM
4. Deagle Armored Beast
5. Battlefield 4 PKPLMG
6. UTS15
7. M60
8. M4A1 Iron Beast
9. Quad Barrel Shotgun
10.M16A1 Veteran
11.Silenced hk
12.MP5DUAL

Note: Some of the custom weapon can destroy tank.

Credit to : Everyone that make the weapon model and weapon limit adjuster.