RE: Walther P22
I bought a used P22 for my then 9 year old daughter about 2 or 3 years ago. She's now 12 and still loves to go to the gun range and shoot "her" gun. The only problem I had with mine is that it won't shoot in double-action-only mode. I left it with a reputable gunsmith for close to a year and he worked on it off and on but was never able to get it to work. Doesn't really matter as it's just a range gun for my daughter. Guess that's what I get for not knowing enough about used guns to check it out extensively.
Anyway, the P22 has been quite reliable and has worked with several different brands of ammo that I've bought, mainly Remington 'Golden Bullet' bulk packs and Federal bulk ammo. I've read various posts about the P22 being picky with ammo, but I haven't experienced that with ours.
It's a great little plinker IMO.