For sales is a JL Biller Reaper PDW chassis system for the Ruger RXM w/pistol brace.  I installed an RXM FCU into this, but never shot it or took it into the field, so it is very good shape.  It includes some extra parts, but you will use the takedown lever and mag release from your factory RXM.  DM or textREDACTED with questions/offers.  FFL not required, the chassis is not a serialized part.  No trades.  Will ship, but only using Paypal for seller/buyer protections.