The Bushmaster Carbon 15 Type 21S pistol has top of the line features of the popular Type 97S rifle in a package that weighs less than three and a half pounds. The upper and lower receivers are molded of state of the art Carbon Fiber 15 material that offers incredible durability, strength and ultra lightweight. The pistols 7 1/4" stainless steel, match grade barrel is chambered for the 5.56 Nato cartridge and readily accepts the .223 Remington cartridge as well. The P21S upper receiver features a full length anodized aluminum Picatinny rail that includes integral front and rear iron sights. The windage adjustable rear sight is a combination ghost ring and precision aperture flip-up. The square post front sights offers elevation adjustments for fine zeroing. The Picatinny rail allows the option of mounting a wide variety of auxiliary sighting systems such as long eye relief and standard scopes, red dot, holographic, or laser sights. The front and rear sling swivel studs allow for the secure attachment of slings and other accessories.