The Frontier Cartridge FR400 300 Blackout 125gr Full Metal Jacket (FMJ) is engineered for shooters seeking military-grade performance and reliability. Loaded to NATO specifications, this centerfire rifle ammunition delivers consistent accuracy, clean shooting, and dependable feeding. Ideal for range training, tactical drills, and high-volume shooting, each box contains 20 rounds of brass-cased, boxer-primed ammo. Frontier, a collaboration between Hornady and Lake City Army Ammunition Plant, ensures quality control and ballistic precision in every shot. Whether you're building your stockpile or training regularly, the FR400 is a solid, affordable choice.