Product Description FrontierA(R) Cartridge 5.56x45mm NATO ammunition is built for dependable performance across training, target shooting, and general range use. This load features a 55-grain full metal jacket (M193) bullet, loaded with HornadyA(R) components, and is designed to deliver consistent function and accuracy. Each round is loaded in brass cases with military-grade boxer primers and propellant, and is new production, non-corrosive, and reloadable for added value. Product Highlights 5.56 NATO (5.56x45mm) 55-grain Full Metal Jacket (M193) load for reliable range and training performance Rated at approximately 3,240 feet per second (tested from a 20-inch barrel) Brass-cased, boxer-primed, non-corrosive, new production ammunition Loaded with HornadyA(R) bullets and built to U.S. military specifications 20 rounds per box (commonly packaged 25 boxes per case / 500 rounds per case) Specs Brand: Frontier Cartridge Manufacturer Part Number: FR200 UPC: 090255711394 Cartridge: 5.56x45mm NATO Bullet Weight: 55 grain Bullet Type: Full Metal Jacket (FMJ), M193 Muzzle Velocity: 3,240 fps (20" test barrel) Muzzle Energy: 1,282 ft-lbs Case Material: Brass Primer Type: Boxer Corrosive: No Reloadable: Yes Rounds per Box: 20 Country of Origin: United States of America Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.