So this stock? https://www.sigsauer.com/store/thin-...terface-1.html
plus this adapter? https://www.knsprecisioninc.com/prod...stock-adapter/
I've been pondering doing this for awhile. I had thought it'd be easy to make an adapter but don't have the tools/time. Lee majors had mentioned making an adapter but it never materialized. I don't know how I missed it when they first came out but I got my hands on the KNS adapter. It screwed in nicely to the AR adapter. You've got a couple of options on stock height. Unfortunately the collapsing stock won't work the AR adapter but I'm pretty sure if you made a straight XCR to MCX stock adapter the collapsible would work fine. It's not revolutionary, just another option.
The other MCX offerings will fit except the collapsible stock. The rails won't fit around the AR adapter. It'd be easy to make an adapter for the XCR with the pic rails interface on it. You'd be able to shave some bulk/weight off the pictured setup and be able to get the rails for the collapsible stock to fit between the takedown button and the charging handle. Like I said, it's not revolutionary. No real increase in function, just a different way to dress it up
Last edited by navalbeaver; 10-17-2018 at 02:47 PM.