Finally picked up my M&P 22 today and I can't wait to get it to the range! Fibers crossed that its not ammo picky 

Thankfully mine loves blazer, since that's my preferred bulk 22. I shoot my M&P22 everytime I go to the range and it's not very pick at all. Blazer, mini-mags, Fed bulk red or blue, Fed 710, Win 555, and CCI SV all run great. I tried CCI quiets but there's just not enough 'umph to cycle the action suppressed or un-.mine eats about everything except cci blazers, and aguila 36gr subsonic. it loves the aguila 60gr subs.
with the blazers, the cases will not extract, but then again, those boxes are about 20 yrs. old. to bad i have about 3 or 4 boxes left. guess i'll just use the in another rifle or pistol.Thankfully mine loves blazer, since that's my preferred bulk 22. I shoot my M&P22 everytime I go to the range and it's not very pick at all. Blazer, mini-mags, Fed bulk red or blue, Fed 710, Win 555, and CCI SV all run great. I tried CCI quiets but there's just not enough 'umph to cycle the action suppressed or un-.
Krabba, you beat me to his crossed fibers! lol
The mags are the real unicorns. Took me a couple weeks to find mine. Just searched for about 5min and couldn't find them anywhere; model# 42251. FYI the 10rd mags are the same thing but with an easily removable spacer below the follower.Wish I could find 12rd mags at a reasonable price