The Steyr ACR used new flechette ammunition that was nominally called 5.56 mm, with a very high 4750 ft/s (1450 m/s) muzzle velocity.

• 而施泰尔ACR使用了新的镖弹，通常被称为5.；56毫米弹药，但是具有极高的4750码/每秒（1450米/每秒）的枪口速度。