Does anyone know of a gunsmith that will mod the stock 17 rnd mags for the M&P 9 to be 15 rnd for NJ compliance? I used A&A in the past, but he is now closed. Thanks.

yes, Mark at 3R1 technologies will do them for around 10-15 bux. he has my taurus mags right now. I believe he prefers to do a bunch in batches so if you contact him relatively soon maybe you can get em in with mine 

Smith has a part number for 15 round magazines.  I think you can order them from their online store or call them.  The part number is 39498.

You can't really find any 9mm M&P mags right now. You have a much better shot of finding 10 bricks of 22 at $20 a brick then M&P 9mm mags, in any size.

 

So you'll have to have yours modified.

PM me if you need mags converted to 15 rounds