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From The PSUPedia
Currently the largest shop in the Gurhal System, the G.R.M. Shop is located in the G.R.M. Headquarters in the West District of Holtes City. Their selection of weapons and armor is unmatched, and some weapon types (such as TCSMs) can only be purchased here. This is also the only manufacturer shop that sells SUV units. The grind counter in the back can be used to upgrade G.R.M.-branded weapons.