Gas-operated, semi-automatic Bushmaster M4 A3 AR-15 Rifle modeled after M4-type carbines with additional barrel length for legal sale individual officers. Chrome-lined military-profiled barrel on this Bushmaster AR-15 Rifle for sale with free shipping at Target Sports USA. Features a birdcage suppressor, manganese phosphate outer coating ensures corrosion & rust resistance. Thermoset composite telestock, pistol grip & 2-piece handguards. This Bushmaster handguards internally shielded against barrel heat build-up. W/E adjustable dual aperture M16A2 rear sight system, A3: 300/600 meter rear sight system (1/2 MOA elevation/windage adjustments).