That’s one of the new Zenith weapons you can get if you have enough achievement points. You get skins that you can apply to your weapons.
http://m.youtube.com/watch?v=q_MR8Cf-JVk&desktop_uri=%2Fwatch%3Fv%3Dq_MR8Cf-JVk
(edited by Astral Projections.7320)
