Good news - My spigot mount came in today, along with the flush mount sling plate and a QD socket for the stock. The socket actually went on my SBR, as I had previously robbed the sling mount off my ACS to put on my X-Ray.
I got the spigot mounted up, as well as the flush QD plate, only to discover two of my QD sling swivels will not fit it. A third (spare, different brand) I had fits just fine, though, so it looks like my old friend tolerance stacking has reared his ugly head. Again.
Despite the issue with the tolerance stacking, the spigot mount is AWESOME. I finally have the space I need for the massive window frames at K&M, and shooting from prone seems to work better off the spigot mount with my BRM-S one notch out.
Finally, I went to grab the bag of parts that came with the X-Ray to get one of the MOE rails out to add to my spigot.... and I can't find the bag. I've looked everywhere I can think of, but no joy. Right now, I am just hoping that the spare parts didn't get tossed out with the box the stock shipped in.
One of these days, I will find Murphy and kick his damn teeth in.
Justin, will the screws provided with the standard MOE rails fit on the spigot mount? I can grab them locally quite easily, and it's easier than ordering one and waiting for it to ship - assuming the stock hardware works.
Edit - The screws with the MOE rail do not fit the spigot, but the spigot included some extra screws that do work with the MOE rail, so that is what I used.