The XM15 is an experimental, metal-free rifle that will be featured in Fareer:Flood Fire Wars.
The XM15 is being developed by Arden Arms for USSEC SOCOM for covert operations in deep cover, enemy territory infiltration. It is composed of ceramic composites completely non-metal in nature, so that the weapon can be obscured easily from metal detectors. It also utilizes other materials so as to be concealable from radar and Xrays. The experimental nature of the materials makes the weapon highly classified.
The XM15 also utilizes experimental ammunition, using a carbon-composite shell around a compressed Noble gas core.
While it is closely guarded, it is rumored that a few XM15 pre-production, field-test models have been stolen, and may be in the hands of criminals.