For those wondering the model the OP was looking for is clockworkFamiliar.
No it isn’t. Quite definitely not.
The thing I’m trying to recall is nothing like as humanoid as many of the suggestions. No vaguely humanoid arrangement of legs and arms, whatever is in the middle.
My recollection is that the product description described it as a mobile guard/security/sentry unit, with sensors to detect intruders as it patrols and at least a means of stunning them .... can’t recall if it had a lethal force option or not. The very fuzzy image in my brain is of something cylindrical - or possibly cuboid - much taller than it is wide with maybe a hemispherical top ... think R2D2 minus the leg bits on the sides and stretched vertically, maybe. Not in the slightest anthropomorphised. Anything that looks like it has arms, legs and a face isn’t it. Anything that looks like a combat walker or mech isn’t it either.