So he's the gunsmith right? Meaning he should be able to tinker and customize your weapons. What if for a fee of "x" amount of glimmer he would be able to attach certain scopes to your weapon. For example, I love the Apple of Discord but it rolled with iron sights and a holographic sight. My alt has the same weapon but I prefer the scope / reticle on that Apple. Since the infusion ability allows us to keep the weapons we like, I think having a choice of scope and reticle, maybe even reticle color would be a neat addition to his services. Oh, and maybe even weapon shaders. I have an OCD thing about matching my outfit lol