Im also a fan of the NP02 - along with a couple of other members of our club. It would be hard to beat value wise.
We have found a couple of little tips that have improved accuracy. Firstly, I dont know if you know, the trigger IS adjustable. Its no match trigger but once set up quite pleasant. We have both removed the front bridge/barrel support to float the barrel more. You can ease it off the front of the cylinder once the filling cap cover has been removed. There is an 'O' ring inside the bridge that is easily removed.
We have also had ours 'tweaked' (NOT for power ) by DM80 on here which has made mine far easier to cock and more accurate/consistent. He replaces the valve spring with a better fitting top hat and buffer.
HTH
Ian