It looks to me like the UNC one is about the same height as the USGI L-mount spleen is talking about.
I have one and it doesn't clear a regular-size LAM replica. Even with the spacer the L-mount can only reach 25mm off the rail. I would guess that the mount shown in the pic is the same.
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Contras A-06: F**k it, we'll do it live.
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