I recently purchased a scar 17 that had a KDG MREX 2.0 rail installed. I bought a PMM rail panel elimination kit and the REP-LOK bottom panel used. When I removed the KDG rail, there is nothing for the panel kits to attach to. Also, the screw closest to the gas block is too short from what came with the MREX rail. Am I missing some kind of inserts to go behind the panel kits and a longer screw for the front of the bottom rail. I've attached pictures to try to describe what I'm talking about.

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There are supposed to be square nuts that ride in the receiver channels on each side for the side panels

I'm not familiar with the MREX or its hardware but the PMM lower rail re-uses the factory screws, PMM sells them on their site

Here's the link for the square nuts (out of stock)