X-Tac Green Tip Ammo is trusted by enthusiasts and professionals alike on account of its reliable performance and value. So load up these precision-made rounds and watch your paper targets drop like flies. NOTE: While the 5.56x45mm NATO round will fit in a .223 Remington chamber, 5.56 NATO is a military round that runs at higher pressures, and is not recommended for use in .223 Remington chambers. Order today!