For the APX RDO plates come in the box (at least with the one I have). I had an RMR on mine for a while and am going to put a DP Pro on it soon. The screws are hex (I think Torx would have been a bit better) and exactly 2mm. A 5/64 driver is all I had in the beginning and I was concerned that I would strip them so I bought the correct size bit.