Carbon 15

The Carbon 15 is a family of lightweight, magazine-fed pistols, carbines, and rifles developed by defunct USA weapons manufacturer Professional Ordnance, with the design picked up after some time by current manufacturer Bushmaster Firearms.

Overview
The Carbon 15 line of weapons are closely based on the ArmaLite AR-15 design. They are distinguished by their carbon fiber construction, which provides an extremely lightweight frame, which is also extremely durable; chemical, water, and heat resistant. The Carbon 15 line are generally 5.56 caliber weapons, however there are 9mm versions of the Carbon 15 pistol and carbine.

Early in 2009 Bushmaster, the primary manufacturer of Carbon-15 pistols/rifles, has begun to include the ejection port dust cover and forward assist in their Carbon-15 M4 rifles.