Rifle Scopes ACOG mount for Docter Red Dot...am I missing a piece?

[shooterman_zero17]

Disclaimer, this is not a sales pitch or ad...I have this from a previous purchase, I did not need it, I am trying to figure out what to do with it and my google-fu is weak. I know it is a mount via which a Docter Red Dot can be piggybacked on an ACOG. Everything I can find is of a mount with wings and doesn't look close to what I have here. They also seem to have another (lower) half to the ring which mounts to (around) the ocular...hence my question:

Aside from some screws, am I missing a critical piece of this mount? Or does it mount direct to the body of the ACOG? If so, what models will it mount to? Is there somewhere that has a similar (or the same) mount listed so I can figure out how much to sell it for? I checked Trijicon, SWFA...nothing looks promising. Maybe my internet skill is crap today and I'm missing the answer.

Anybody with input/more familiarity than myself with ACOGs that can help? Cause I don't know jack about them aside from I glanced over Trijicon and nothing matched.

Thanks in advance.

ETA:

 

[mewillis]

I think you need the specific ACOG that accepts that mount IIRC.
Docter should be able to tell you, Docter Red Dot Sight Mounts

 

[shooterman_zero17]

I have not checked Docter yet as the last time (when I purchased this used) I went looking for info on repairs (if needed later), their website did not seem to have been updated in quite a while. Seems it has now...much appreciated.

 

[Redmanss]

Looks like the mount that runs on top of a TA01NSN model that has the backup iron sights on top, it replaces the rear peep sight. They had wing and non-wing styles back in the day. I believe you just use the screws that mount the backup rear sight to mount that one to the ACOG itself, it's been a few years since I mounted one up, so you may not necessarily need to come up with the screws.