I was recently contacted by Han, a member of the Taiwanese arms-cool forum community, in which he explains that the extended rail is being developed by a Taiwanese member of this forum and its still in prototype phase.
According to Han, the CnC prototype is already available but more RnD is still required.
Nevertheless he pointed me out to some more great photos that will surely spice up all Kriss Vector lovers day!
Some more photos:
More information soon, stay posted!