I know it's been some time since anyone posted but just in case...

Three to add:

M&P 15-22 Sport DFRxxxx 06/2019 - No issues at all!

M&P 15-22P Pistol WARxxxx 04/2022 - Shoots great!

M&P 15-22 Sport MOE-SL FDE LBKxxxx 02/2023 - Have not had a chance to shoot it yet.

First post, been really happy with them and find myself interested in their history. Trying to find info like when were they initially released (something more definitive than 'early 2009'), when did the Gen 1 15-22's cease production, and the production start and end date's for the first M&P 15-22 Pistol. If anyone knows of sources for that type of info, I'd appreciate any guidance! Working on a 15-22 production time line.