Guys I have come up empty on my searches... I'm looking for a picatinny rail riser that is very similar to the Unity picatinny riser except that it cantilevers both directions instead of just forward. It appears to be about the length of an AR upper receiver. To clarify, this is an actual product that exists.

I've seen them on a few different rifles here and on youtube videos. I finally have a reason to get one and now I can't find it lol.

Edit: A couple more details about what I remember. The riser has crossbolts in the middle and sweeps upward (like Unity riser) in both directions from the middle.

Overbore Systems Kenu Riser

Thank you!

Much cheaper option than 2 Unity mounts if running an EoTech and magnifier with OEM flip mount.

Yea, I'm gonna get the Holosun 510c and magnifier combo.

I want the Eotech setup, but this is for a backup gun and I can't justify the cost at the moment.

I just use full receiver length risers from UTG Pro - keeps optic and magnifier at same height. 0.5" and 0.75" available.

BCM makes risers in multiple lengths FYI that seem to be reasonably priced. No experience with them, though.

^ ^ ^ Primary Arms has the BCM riser rails on sale right now ^ ^ ^

The Utg pro/ slim are nice, and they’re are cheap enough to chop a bit if needed.

Irregular Defense makes a modular mount like you describe.  Believe it’s called the OMM.

It's also expensive as hell.  Super cool but NOT cheap at all.