The Carbon 15 is a family of lightweight, magazine-fed pistols, carbines, and rifles developed by defunct United States weapons manufacturer Professional Ordnance, with the design later picked up by Bushmaster Firearms.
The Carbon 15 line is closely based on the Colt AR-15 design. They are distinguished by their carbon fiber construction, which provides an extremely lightweight frame. The Carbon 15 line are generally chambered in 5.56×45mm NATO/.223 Remington, however, there are also 9×19mm Parabellum versions of the pistol and carbine.
In early 2009, Bushmaster began to include the dust cover and forward assist in their Carbon-15 M4 rifles.