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Ruger RXM Chassis?
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There are some frames but I don't think a PDW style chassis has been released yet. I think Chairmanwon was working on a homemade FCU using a SCS flat and bending it with printed bending jigs. If he gets that to work then I see a lot of future development with the RXM.
I think it hits that perfect sweet spot of Glock gen 3 compatible and the FCU