Looked for this skin from that video preview?
Well, since that mod was hidden...
Here, some old video:

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If you still didn't get it - this is a custom skin for Signature .40 pistol (sinlge/akimbo).

My first attempt (actually, not first, but who cares) on skins creation, so, please, criticize as much as you want.

Check the "Images" tab now.

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Other Vocaloid cutsom skins:
HOLT 9mm || Vivid Bringing
Predator 12G || The Disappearance
Breaker 12G || Double Lariat