What's a good under leaver?

I mainly shoot PCP's. I was thinking about getting an under leaver gun for squirrel hunting for this up coming season. Most of my shots would be way under 50 yards.

I guess these would be my criteria in order. Can you guys point me in the right direction and maybe give me some brands and models I can start researching? Price is not really a big deal.

1. Accuracy

2. What caliber would be best for hunting with a Springer. My go to PCP is a .25, I am thinking a .22 would be a good choice??? Look's like the pellets are more readily available than say .20???

3. quality/customer/service can you get parts if you have a problem?




 
HW77K or HW97 in .177

Very easy to shoot accurately, and have a better shot cycle and far fewer mechanical issues than the TX200.

The HWs also have a positive locking underlever which makes it better for fitting a sling. 

I've been squirrel hunting with old HW77Ks for years and they really work great. Keep a lightweight low power scope and they aren't overly heavy, but still have enough weight to be very easy to shoot. 


 
AA TX200. Mine is .22 and a nice shooter. After I shoot my Diana 460 Magnum a few times, I have to put it down - thing rocks me. My 460 has already broken one scope. After I added one of those Diana ZR (zero recoil) Bullseye scope mounts to it, the new scope I put on it is doing fine.

The TX200 is much gentler and a hack of a lot more accurate - and doesn't seem to be pellet picky - and hasn't harmed the Hawke Vantage Scope I have on it.

My PCPs are my squirrel killers, but the .22 TX200 has taken two for me. Both where about 25 yards away - on my bird feeder, destroying it, about a week apart. One dropped dead, the other thrashed around for a bit, then died.