The AR-91-A1 is an Assault Rifle made in 1991 chambered in 5.56x45mm NATO ammunition. It is a modified version of the AR-91 battle rifle chambered in 7.62x51mm NATO. -STATS- Ammo type: 5.56x45mm NATO (uses a special cartridge designed for higher pressures) Magazine size: (regular) 25-Round Double-Stack Firerate: 405 RPM (tested) Muzzle Velocity: 830 m/s