Buster is best described as a some what cheerful weapons dealer. Despite his ragged clothes with many gun-bluing stains, Buster is an exemplary weapons merchant. He sells high quality weapons at affordable prices. He is a true guns nut and so loves working with them, including upgrades. He has attachments available and he may be willing to sell to a professional looking for quality.
Buster is a weapon merchant in NCR Bazaar, selling mid-to-high level weapons and ammunition. In addition to weapons, he also has a single Triveld x10 scope for a single hunting rifle, available for sale for $500. Each of the three shelves behind him have items available for purchase, and depending on whether you use the Barter button or enter the screen through dialogue, you'll get a different shelf's inventory.