FN America Fn Ss198lf 5.7x28mm . 7x28mm Caliber Standardized In 2020 By Nato Was Originally Designed In The Late 1980s For Use With The Military Issued Fn P90 And Fn Five-seven Pistol. With Three Decades Of Trusted Use The Fn 5.7x28mm Drastically Improves Range Accuracy And Terminal Performance From Small Arms With The Hyper Velocity Bottleneck Pistol Cartridge. Package Contents: FN America Fn Ss198lf 5.7x28mm