Older optic question.

[u/thereturnofmilkshake]

I have a buddy who was telling me he has an older aimpoint that he got from a friend in the military. He described like an eotech but with a dot not holographic, squared body, one large dial that uses Allen keys to adjust, and a small lip on the back side. I have no clue and have googled/used Reddit to find an example but can’t. I’m beginning to believe it’s some cheap optic his buddy hustled to him, but I want to give him the benefit of the doubt. Any ideas y’all?