Some P22's slide might break. There are quite a few threads about it.
I bought the Walther PPQ M2 22lr from cabelas for $269.99 plus tax.(after 30 off coupon) a few weeks ago.
So far Federal, CCI minimags are ok. Went through about 300 rounds. I encountered maybe 2-3 failed to eject for federal 22lr. for CCI minimags so far so good.