native custom_weapon_add(const wpnname, melee = 0, const logname = "");
Full weapon name
If nonzero the weapon will be considered a melee weapon
Weapon short name
Adds a custom weapon to the stats system.
The weapon name should be the full display name of the gun such as "Desert Eagle" while the logname should be "weapon_deagle".
Cusom weapon id (>0) on success, 0 if no more custom weapons can be added