Bushmaster Firearms has introduced a new line of rifles and pistols that feature molded Carbon 15 fiber composite upper and lower receivers, stainless-steel barrels, and a modular accessories system. Built from the AR15 pattern but using Carbon 15 composite materials, the weapons are 40 percent stronger and lighter than the aluminum-based AR15. Carbon 15 rifles and pistols have a one-year warranty and are shipped in a lockable hard plastic carrying case with a 10-round magazine and manual.