How to add compatible scope to a weapon? or change default zeroing from 300m to 100m?

[Tomsz 1]

Hi guys, I would like to know how I would add a scope to make it compatible with my weapon mod I have from Arma2, like I have tried putting this into the weapons cfg

class CowsSlot : SlotInfo

{

// targetProxy

linkProxy = "\A3\data_f\proxies\weapon_slots\TOP";

// display name

displayName = $STR_A3_CowsSlot0;

// class names with items supported by weapon

compatibleItems[] = {"optic_Arco","optic_aco", "optic_ACO_grn","optic_hamr","optic_Holosight" };

};

But before start-up of Arma3 I get undefined basis cows slot info, Or even how would I change the default Zeroing on the current scope attached to the gun would that make it easier? as I am just swapping scopes specifically because I do not know how to edit the Arma2 Weapon scope to change it from 300m to 1000m in the files, any help is greatly appreciated thanks!