I had it a week before thanksgiving finished it in the middle of January. This is what you do. 1. Check the gunsmith religiously on your phone every time his stick resets 2. Buy any green special weapon engrams that Rahool sells, this is how I got half of mine. 3. Run highest level strikes and you'll get them as drops This is basically how you'll get them! You'll get it man trust me! I got lucky when the gunsmith sold two blue fusion rifles when I just needed 2 to finish!