I received one of Brownell's new products e-mails today and they are showing the Gemtech adapter for the M&P 22. It also fits the P22 Walther, either barrel length. Apparently, these both have a metric thread pattern and the adapter changes over to the common 1/2 x 28 used on the AR-15 and a lot of suppressors. The stock number is 100-008-127. I'm still waiting on my M&P 22 to be made. Check it out at Brownells.com. Bob