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Alfred, there will need to be some modification for the follower to work properly : https://www.youtube.com/watch?v=SeeeTgRMlaE
The X4's factory Tube has a ribbed bezel inside to retain the follower and spring plug. This will need to be removed or smoothed out. Once that bezel is out of the way, any TacStar, Briley, Nordic Components, or Choate MXT for the Supernova or Nova will thread and feed with the appropriate spring length. The same threads often fit Stoeger, some Berettas, and some Franchi SA's as well, therefore implying those selections also fit the X4.
Alfred, Will not function as configured on RIA X4.
