Image 1 of 2 Image 2 of 2 FRONTIER 556NATO 55GR FM193 20/Box $14.99 Sold Out Frontier Cartridge, Lake City, 556 NATO, 55 Grain, FM193, FMJ, 20 Round Box Sold Out Added! Frontier Cartridge, Lake City, 556 NATO, 55 Grain, FM193, FMJ, 20 Round Box Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More You Might Also Like Hornady Frontier 5.56 NATO 55-Grain Centerfire Rifle Ammunition - 20 Rounds $10.79 Winchester USA 5.56mm 55-Grain FMJ Ammunition - 150 Rounds $89.99 Sold Out Winchester USA 5.56x45mm NATO 62-Grain $13.99 Sold Out US CARTRIDGE 5.56 SS109 GREEN TIP 62 GRAIN FMJ 200/BOX $149.00 Sold Out Magtech, First Defense Tactical, 556NATO, 55 Grain, Full Metal Jacket $24.79