Any of the NV rail heights are going to be limited in their design.
Unfortunately, several of the chassis designs seem to not give a shit about how high they make you stick your scope and/or clip-on NV.
The ones that do try to keep their designs low still have constraints.
* The through hole/ bridge usually needs to accommodate the larger barrel contours as well as the smaller ones. Some customers will still insist on using a 1.250" straight non-tapered barrel..... geez. Business economics and efficiencies dictate that each product needs to work with a wide range of other products out of your control.
* The 1913 rail and the bridge span supporting it really needs to retain a reasonable amount of thickness in order to avoid any failures or damage due to impacts with or without $5K to $20K worth of alien tech clamped to it.
These two things alone will limit just how low you can get the 1913 rail in relation to the center of the bore.
Fortunately almost all of the chassis makers have adjustable comb heights that would allow proper head position regardless of how high your rings are.
For what its worth, for the first 25 years I was doing this, we all thought it was a mortal sin to use anything but the lowest ring height possible. Now days the better ring designs (like NF Ultra, etc.) are so rigid that even the extra high versions are equal to or better than the lower models of yesterday.
Bottom line is that you just might have to consider a different ring height to get you where you want to go.
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