I can't imagine why they are leaving? Has to be more to this story. They must have auck nearly $1m easy into that building/ range....why walk away from that?
It may not be the store or the family who ran it who has the money tied up in the building. The land under the building is owned by 'Twigg Family LP' which has an address colocated with a motorcycle shop in Hagerstown.
As it is a bit of a purpose built structure, I would expect that another firearms store will take its place.