Get a TBB and a decent hopup (R-HOP?
) in there and the P* will shoot like a dream.
If you are not worried about air, and primarily play under ~160 foot ranges, you might want to look into the ORGA Wide boar barrels. They create a cushion of air around the BB as it goes down the barrel, they have been proven to tighten up groupings vs a TBB with the proper settings on the FCU. They will require you to use some more air though.
These barrels thrive in P* because of how precisely we can control the amount of air going downrange.