One negative of the PDP is no plate for a Romeo 3 Max. Really like the Romeo 3 Max/XL for low sun angles.
As it turns out, I still have two Walther Q5 match pistols, and the pieces interchange with the PDP. Since a R3 Max plate is available from Springer Precision, that is a work around to drop a Q5 Match upper on the PDP lower. Will see.