Head, Torso: Lamprey
Arms: Eel
Waist: CORPS
Legs: Undertow
I've got some strange affection for Lamprey figures. I've collected a few complete, but even more random parts here and there. I reckon that as long as the figure has a Lamprey torso & helmet, it's a Lamprey.
In this case, I added some spare Eel arms, CORPS waist & Undertow legs. Normally I like to cut the stock off the Stalker gun & add a sling for my Lampreys, based on a weapons custom I did as a kid ... by accident. These pictures were taken before I finished the gun mods.