I have been summoned? Jackson area I would check out Cowart's on hwy 80 in Pearl, Swann's Gun and Repair on Old Canton rd in Jackson, and Guns and Gear. Those typically will get in older guns as well as new stuff. The first two definitely have that old gun shop feel to them. For new stuff The Armory in Ridgeland is pretty decent. Van's in Brandon usually has the best inventory but you may have to look for awhile to get a deal. In Starkville area I would check out Army Navy Pawn and Deweese's Pawn. If you want a road trip Mitch's in Hamilton is almost always worth the drive as is Gary's in West Point. If you want to grab lunch around Jackson sometime give me a shout, but I tend to stay in the suburbs these days.
If you end up on the coast Dad's Super Pawn in Gulfport is usually decent as well.