I make the REM 21 LED illuminator for that sight so I have been trying to figure out how to adapt the REM 21 to fit the RX30 sights.
I think I have a solution. It is a work around but it works and holds tight onto the RX30/34s
With a little dremeling and moving the screw hole slightly and applying some steel epoxy putty the thing came out pretty good.
To attach the REM 30 (Reticle Enhancement Module RX30) to the sight you first remove the screw on the left side of the sight. Place the REM 30 onto the sight and place the longer screw (which comes with the Illuminator) into the hole and tighten it down. Bingo!
If anyone wants one just go to https://m1bullpup.com/ and order a REM 21 and write that it is for a RX30 sight and I will do the adaptation. No extra cost. It will take me a day extra to adapt and ship.
