American Eagle 5.7×28 Ammo 40 Grain FMJ 50rds – AE5728A

Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.

The American Eagle AE5728A is a 5.7×28 ammo load engineered for high-capacity pistols and carbines chambered in FN’s bottlenecked cartridge. Each round seats a 40-grain full metal jacket projectile atop clean-burning powder and a Federal-grade primer, delivered in reloadable brass cases. At 2250 feet per second from a 4.8-inch barrel, the load generates 450 foot-pounds of energy — enough to cycle the Five-seveN’s delayed blowback system and the PS90’s straight blowback mechanism without excessive recoil or case deformation.

Performance at a Glance

Federal Premium, the parent company of American Eagle, introduced the 5.7×28 cartridge to U.S. commercial shooters in the early 2000s following its adoption by NATO special operations units. The round’s flat trajectory and minimal felt recoil make it a popular choice for defensive handguns and range work. This load uses a non-expanding FMJ projectile, so terminal performance centers on penetration depth rather than expansion. For defensive applications, consider American Eagle’s 40-grain TMJ variant or Federal’s HST offerings in the same caliber. For range drills and volume shooting, the AE5728A offers cost-effective, reliable function. Shop our complete 5.7×28 ammo selection for additional projectile weights and bullet designs.

Expect this load to run cleanly in FN Five-seveN pistols (MK1, MK2, and MK3 variants), Ruger-57 pistols, CMMG Banshee uppers, and the FN PS90 carbine. Magazines holding 20, 30, or 50 rounds feed without issue when properly seated. The brass cases eject with minimal soot buildup and reload easily for handloaders with appropriate 5.7×28 dies.