Just picked up one of these.  I was kind of dismayed to discover that you have to remove the rail to install it, and it's held on by a combination of an o-ring and a snap ring.  Unless I'm an idiot and I'm missing something completely here...

Should be a very secure mount with virtually no footprint.  I like.

Here is my question:   I know this is designed for Keymod.  What are the outside dimensions of the section that fits in the Keymod slot?   I have a Daniel Defense Modular Float Rail (MFR).  See photo attached.  While not Keymod, the modular slots attach 3" proprietary DD mini-rails via L shaped tabs that slide into the slots and then tighten.  If your post is the correct outside diameter and the nut or attachment device on the inside of the tube is sufficient to keep the post in place I might be able to use it and save some weight.  Right now I have to attach a mini-rail and then a picatinny bipod adapter.  Your approach is much lighter and elegant if I could figure out if it would work.  Or do you suggest a different solution?

Ok, thank you for the response.