Please help me ID this turret bit

[Froggy the Great]

So I got a bunch of these turret bits from someone and I've been using them as robot heads.  I now am running out and have no idea where to get more.  Does anyone recognize this robots head?



I'm one squad short of a reinforced platoon of these guys, so any help would be greatly appreciated.

[Gunbird]

I could have sworn they are BFG Chaos Idolator turrets.....but they are not. I'm intruiged now