How to get the objects inside another object and put them in a array?

Im making a 3D fps game called "Tactical Warfare" And right now im trying to add attachments, but i need to find gameobjects that are in another gameobject and put the in an array.

heres my current script im trying to do it and primarySightsPath is a Transform.

 if(Input.GetKeyDown("j")){
     primarySightsPath = GameObject.Find(primaryGunObj.name + "Gun Animation Parent/Attachments/Slider/Sights").transform;
     for(var attach : Transform in primarySightsPath){
         primarySights.Push("attach.gameObject");
     }
    }