It's safe to say Hamilton, Mont., is not a usual transplant spot for Vin Diesel look-alikes with Brooklyn accents. But Hamilton is exactly where native New Yorker Lou Tuminaro chose to move his family to realize his dream of owning a firearms business. "Gunfather" takes viewers inside The Custom Shop, where antique and collectible rifles, shotguns and pistols are repaired, restored and sold. Thriving in his element, Lou artfully negotiates with customers to get his hands on rare gems at rarer prices. He also travels to shows, estate sales, auctions and other events to buy inventory. Featured as well are Lou's wife/business manager Theresa, aka "T-Bone"; dad "Pops," who taught Lou everything he knows about guns; and kids Louie Jr., Nicole and Alex.