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[2][3] is closely based on the Colt AR-15 design.

Carbon 15 rifles have carbon fiber upper and lower receivers which are lighter than the standard aluminum and steel construction of AR-15 receivers.

Carbon 15 rifles are generally chambered in 5.56×45mm NATO/.223 Remington,[4] although Bushmaster also produced 9×19mm Parabellum versions of the pistol and carbine.

[citation needed] In early 2009, Bushmaster began to include the dust cover and forward assist in their Carbon 15 M4-style rifles.