My interest in delayed blowback PCCs mostly exists because I’m left handed and don’t like how direct blowback guns tend to eject crud into my face when shooting suppressed. Having an RDB upper I can swap onto my normal SBR lower is great for training, as it lets me use the same gear as 5.56 and just swap in the 9mm RDB mags. I can use that in a lot more places than a 5.56 gun. I also have a Grand Power Stribog SP9A3 that I like a lot, but am hesitant to recommend without caveats.
If I was right handed I would probably not care nearly as much about using delayed blowback PCCs.
If I was right handed I would probably not care nearly as much about using delayed blowback PCCs.