Ok, I found the weapon, now I remember why I loved it
The Mjölnir: A chain ligthning gun/Hidraulic hammer weapon
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http://i.ytimg.com/vi/b85EMRLS_mQ/maxresdefault.jpg

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http://i.ytimg.com/vi/b85EMRLS_mQ/maxresdefault.jpg

Here are the details of it
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The Mjölnir is named after the Norse mythological weapon, Mjölnir. It is a combination of a Chain Lightning Gun and a Hydraulic Hammer.
The upper tool: The upper tool of Mjölnir consists of a Tesla Core with a Diffraction Torus Tip (Chain Lightning Gun). This produces an electric arc that spreads to nearby targets.
The lower tool: The lower tool of Mjölnir consists of a Hydraulic Engine with a Conic Dispersal Tip (Hydraulic Hammer). Allows tool to be swung like a hammer. Inflicts more damage than the Default Tip.The armor is the security one if I remember right