I have been looking for an M&P10 model 811308 with the 20 round mag and adjustable stock for over six months. Every online and B&M store has been out-of-stock every time I look. The only ones I can find are the model 811310 compliant 10 round non-adjustable stock versions. Has S&W stopped making the 811308? I even called S&W and they just blew me off with a canned answer about they don't know when specific guns will be produced.

There also hard to find on Gunbroker. Lots of 811310 compliant versions but few if any 811308's

Seems odd to me. It's like they have stopped producing them. I keep kicking myself for missing the Grabagun $999 sale in early 2015.