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If you do anything, shim the gears!
The 552 can also be a bitch to take apart (rather to put back together) as the selector gears on the lower receiver need to be in the precise position. with the plastic receiver, it is possible to fold the sides out of the way to pull the trigger/handgrip/mechbox assembly out. Just be careful.
Mine performed okay out of the box, except that the hopup was shit. I fixed that by changing just the rubber and bucking.
I gamed it in cold weather and blew up the piston, so then I completely re did the whole mechbox, and barrel.
I made my barrel extend just up to the end of the flash hider; you could also put on a supressor and go way longer. But just like Roko said, make sure you get a matching ported cylinder when changing the length of the barrel.
put in a Prometheus M100 spring, also a new air nozzle. Shoots consistent 350 and bang on target every time, too.
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