If you have a M&P 22 Compact and want to increase round count and still keep the slide lock option. I Cannot recommend this conversion enough.

https://www.nescustomdesign.com/product-page/m-p-22-compact-high-capacity-upgrade

I bought them on a whim. I wanted to increase round count, however this was the only product that I could find that offered keeping the slide lock option. Swapped out the followers when I got them and commenced to putting over 300 rounds thru them with perfect feed and function. They shipped fast also.

I don't have and vested interest in this other than I bought them and they work great.

Thanks.  I'll be ordering some of these myself.

Hm. For $20 for 2 I'd say it's worth a gamble