Shop › FRONTIER 556NATO 55GR FM193 20/500 FRONTIER 556NATO 55GR FM193 20/500 $15.95 Frontier Cartridge Lake City, 556 NATO, 55 Grain, FM193, FMJ, 20 Round Box FR200 Quantity: Add To Cart Added! Frontier Cartridge Lake City, 556 NATO, 55 Grain, FM193, FMJ, 20 Round Box FR200