The Bushmaster XM-15 16" Heavy Barrel Carbine provides heavy-duty performance whenever duty calls. The heavy profile 16" chrome moly vanadium steel barrel is manganese phosphate-finished to insure protection against corrosion and rust, and the carbine features a threaded birdcage flash suppressor and a 6-position telescoping stock. The upper and lower receivers are machined from 7075-T6 aircraft aluminum forgings for light weight and added strength. The carbine ships with a chamber flag, sling, and a 30-round magazine. This model has a 16" barrel and the A3 upper receiver features a Picatinny rail, a removable carry handle, and a 300-600 meter rear sight system with 1/2 MOA elevation and windage adjustments.