You are in the most historical county in the US as far as the Wild West was concerned. Take the Charleston route (Be careful, watch for cattle) and see the San Pedro where the Morman BN was nailed by the Bulls, go to old post and look around, Tombstone is a must but don't buy anything at Spangenburgs gun store. eat at Nellie Cashman's restaurant, the Birdcage theater, the Big Nose Kate's Bar was the Grand Hotel which was the hotel Doc and Kate had rooms. In Bisbee the gulch is historical but look out for the anti-military left wingers, eat at the Hotel in Bisbee, go to Douglas and have lunch at the Gasden Hotel downtown, it was where Pancho Villa galloped his horse up the stairway. Drive to Nogales and stop in Patagonia, or go to the Steak Out in Sonoita, then to Nogo for shopping.
Don't take weapons into Mexico, park in the lot at the McDonalds.
Firearms, the best place to buy guns is Mike Chasse Thunder Mountain Custom rifles, or Trailboss if you buy from anyone but Gary, the prices there are 100 bucks more than the Sportsman's center or Chasse but they will deal if you insist. Trailboss has a great smith in Mike Benton who was once the NCOIC of the Forts rifle team. Shooting, the Plinking range on post is open on weekends but the really great NRA range on highway 90 half way to Bisbee is well run and maintained. Senior's at Buena are turning 18 this time of the year and the U A has a nice campus here.