Welcome to the addiction known as Air Rifles. The two you mentioned, I'm personally unfamiliar with but have done enough reading to realize the trigger is always a possible weak link. Now not sure on the NP2 variation but the regular NP models have been known to have horrible triggers. Most of it is due to a long travel. Some are better and some are worse. I do own a Crosman Stealth Shot and that one is a regular NP model. Trigger was long and heavy, with creep.
There was also an issue with the seal in mine, and it was damaged at the factory on installation. There are many sharp edges in these guns and that can ruin a seal and also cause scraping, grinding, and general felt roughness on cocking the barrel. In the one I tore down and put back together there was also noticeable scoring marks on the piston.
The best thing you can do at this point would be to shoot it maybe a half tin of pellets (El Cheapo is fine) and get a feel for the rifle itself. Would not look for too much consistency out of it for at least 100+ shots. Who knows, you may have good ones that don't need a thing!
Some common things to keep an eye on during shooting are:
1) Check stock screws up front and rear at trigger guard for tightness (check every 50 rds). A lot of shooters take the screws out, degrease them, and apply blue loctite then reinstall the screws.
2) If you start getting vertical strings check your barrel pivot screw, and tighten it a little. Do not overtighten as that will wear the nylon washers out quicker. IF the vertical stringing continues or groups do not tighten up you may have a piston seal issue.
3) When mounting a scope it's a good idea to blue loctite those screws also. Preferably you want a one piece base/mount. Air Rifles are notorious for killing scopes. The combo packages usually contain good break in scopes but they are toast after that. Good scope brands are Hawke and UTG, heard good things about Mantis scopes too. BE sure you get a scope later on that either has Adjustable Objective (Parallax) or one that has a low Parallax from factory(30 yds or less). Always buy scopes that are rated for air guns. Regular run of the mill scopes are usually parallax adjusted at 100yds which is too much for an air rifle.
4) Prepare to spend a LOT of coin on pellets. Air Rifles are fickle beasts and can be picky eaters. Good first bets are the Crosman Hollow Points, RWS superdomes, H&N Field Target Trophy, and JSB pellets. I've personally had decent luck with the H&N's. There are many pellet types and brands out there and weights. Invest in "Sampler Packs".
5) Do not ever use any type of solvent in the barrel or anywhere near the power plant. Clean your barrel with either an Otis-like device or do like me.. Use bamboo skewers to push through a cleaning pellet with a drop of Goo Gone or 91% rubbing alcohol. Push a couple extra dry cleaning pellets through. On your 22 it will be much easier than .177 because you can use a real cleaning rod GRANTED you are very careful especially around the crown. Use pure silicone oil on your breech seal. A little drop is all that it takes smeared on it every now and then. It's ok to use some type of oil on the outside of the gun (barrel, receiver, etc.) just make sure it does not run down into the piston area.
6) IF you do not like the trigger and the adjustments do not get you where you want to be you can get a CDT trigger or do the RC bearing trick, although I am not familiar with the differences between the NP and NP2 triggers.
Most important: Take your time and get to know the air rifle. Learn to be patient with it and yourself. Trigger control and hold type is everything in an air rifle.
Best of Luck and hope this helps some.
