Either the M&P 22, Ruger SR22, or a Ruger Standard. We use the M&P 22 for our youth shooting camp and they work great!. My son learned to be a top notch rimfire pistol shooter with our H&R 999 and later an SR22. He is fast and accurate with both. Personally, nothing shoots better for me than my old Ruger standard 22 lr with a 4-5/8 barrel. I think a bargain as most people think the MarkI-IV are superior, it is a heavy pistol with a very good trigger and while more ammo finicky than a K-22, the weight of the gun minimizes felt recoil very nicely and it will eat just about any standard pressure plated 22 lr...not longs, shorts, etc.