Shop › AMMO INC ST 5.56 55GR M193 20/500 AMMO INC ST 5.56 55GR M193 20/500 $14.99 Ammo Inc Signature Target, M193, 556NATO, 55 Grain, Full Metal Jacket Bullet, 20 Round Box 556055M193-A20 Quantity: Add To Cart Added! Ammo Inc Signature Target, M193, 556NATO, 55 Grain, Full Metal Jacket Bullet, 20 Round Box 556055M193-A20