Gentlemen;
As I understand it, S&W is having their mags manufactured by Mec-Gar. And Smith is only 1 among many that do the same. Mec-Gar is just swamped, and you can't get them to respond to any communications right now about delivery dates. And they are quite tacky about it.
Buy what you can, where you can, and be happy you have some. I played bloody hell getting mags for my new Walther PPQ. Had to get them thru Earl's Repair service as Walther America didn't have a damn clue when they would get any. And they weren't cheap either. Not quite as expensive as 44Mag's M&P 9 full size, but almost. As much as I like my PPQ, I will probably sell it as I am not impessed with Walther America's customer service.
Anyway, it doesn't look favorable for M&P mags for the immediate future. Wish I would have held on to my 3 extra M&P 9 FS mags when I dumped the 9FS that wouldn't group. Thought the PPQ would replace it, but I do miss a nice M&P 9FS.
Stay frosty, my Brothers.
Ofc.JL