I put a slidefire stock on my M&P 1522 and have had the most fun out of a .22 in a long time. Full auto is deadly on armadillos!
The new model slidefire stock doesn't need to be modified to clear trigger guard. Just have to lighten trigger spring and apply TW25B grease to buffer tube. OH, and take weight off barrel section of gun ( remove accessories: scope, bipod, etc.)
Try one and you will love it!

I just watched the video on their website. Very interesting.
Pics???

movie please!

Didnt think the slidefire would work with a .22

Yeah numerous people said it would not work at all with a .22- I am curious about this!

I can't decide to get one or not... can always put it on the AR. hmmm, if I could use it on the 15-22 without doing trigger mods i'd be all over it