I have a couple of the 6909s for my Berettas, and the M&P mags will slide in, but they are ridiculously tight, too tight for practical use. Some sanding or trimming of the inside may help, but I would honestly just avoid using that model number for the M&P.
I ordered the 6900, It's for the wife. She tried an Uncle Mikes mag holder with my P99 last fall and liked the sloppy fit, it was easy to draw the mags out compared to my Galco DMC that fit tight. I'll let ya know how it fits.
Go figure, she likes it loose and I like it tight.
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