One of the world's most popular military and law enforcement carbine models, the Bushmaster M4 features the distinctive M4 barrel profile and a six-position telestock for ease of deployment. The Bushmaster XM-15 M4 is modeled after U.S. Military and law-enforcement utilized M4 Carbines, but with additional barrel length to make them legal for sale to individuals. The 5.56mm/.223 Rem. calibered 16-inch barrel is chrome-lined in both bore and chamber for long wear life and ease of maintenance. For control of muzzle flash and muzzle rise in rapid fire, a birdcage type suppressor is factory installed. A mil. spec. manganese phosphate outer coating insures protection against corrosion or rust on the barrel and all critical steel parts of the weapon. The telestock, pistol grip, and two piece handguards are all molded of strong black thermoset composite material and the handguards are internally shielded against barrel heat build-up. The rifle weighs around 6-1/2 pounds and has a 1 in 9" right-handed twist. This rifle's stock, metal, and bore are all in very good condition.