Create Unique Weapon with legendary effect in CS

[djangoku]

Hello.

 

I am trying to make my first own mod and am using the latest version of the CK. For now i want to create some Unique weapons, like f.e. Kellogs Pistol.

My problem is, i cannot find the method, how legendary effects are applied to an item. I saw a video, where the guy made a quest and other things for his weapon, but it seems the effect is random like dropped weapons are. But i want to make static stats weapons, with an effect i determined. So, can anyone explain to me, how i can give an legendary effect to my custom weapon?

 

I tried to take a look at Kellogs Pistol, to see how it was done, but there is no hint where the legendary effect is applied.

 

Thanks.