Let's say your upgrading fatebringer u give the gunsmith your fully up graded fatebringer and then u give the gunsmith the new raid hand cannon the new raid hand cannon is deleted but your fatebringer now has the potential to be 331 this or the way u upgrade to the necrochasim the gun starts as a vog weapon and after you kill a sertan amount of vex u can go into hm vog and by killing atheon u can get a crux of Crota type thing that is used to upgrade you 300 vog weapon to331