There's no real way around the rollout issue short of sending the marker to PPS for wedgits. I think it's money well spent, especially for a primary marker, but your mileage may vary. Actually, if this is going to be your primary, I'd say see if you can get a P68SC or PMI-1 instead as the longer barrel helps a bit with accuracy/efficiency (the PGP's control bore is sub six inches if I remember correctly).
I'm assuming an old, non-cartridge valve PGP? The list of mods changes depending on which version you have