Anglers...but you probably know about them since you location is listed as Annapolis.
Molly's is not on the way but not too far out of the way.
Also you can take a little side trip to Shore Sportsman or, better yet, Albrights (lot'sa shotguns, old collectable, hunting or trap guns- and they're a Guerini dealer. These 2 are in Easton...maybe 15 miles off the beaten path from a Rock Hall route)
Chesapeake Guns is on the way
You can check out Fred's Firearm Service right between Chestertown and Rock Hall. He works out of his house so not a lot of inventory but he usually has some interesting consignments there and can order anything you like of course.