He operates from the abandoned gas station, just across from the LIMB clinic. He sells various types of weapons, ammunition, weapon upgrades, explosives and miscellaneous items. Upon Adam Jensen's return to Detroit from Picus Communications, Grayson's inventory will be restocked with better items.
- He is mentioned in the pocket secretary found on one of the Purity First terrorists in the Milwaukee Junction factory.
- Grayson's face is not unique and can be seen on a Sarif employee, Hive Customer and Taggart's bodyguard.
- Grayson and the MCB Gang Leader are the only arms dealers that do not wear brooches on their chests.