Factory Sig Sauer 10rd magazine (converted to 15rd) and CMMG 22 conversion 26rd magazines for my Sig522, modified for faster loading. Cuts are a bit sloppy but it was difficult using a dremel by hand. It works, no speedloader required. Sorry about the camera orientation.
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I did not know the M&P 15-22 mags will work in the Sig522. My friend I go to the range with bought his 15-22 the same week I bought my 522. His are much easier to load, but I like the 522 better. I'll have to try one of his mags to see if it fits, as I thought they did not. I'm using the CMMG mags from their AR15 22 conversion kit.
It looks good and tuff Ive been looking for good mags for the 522 the S&W M&P 15-22 mags will work in the 522 they are made of polimer and they are half the price and they have feed assist watch this video it will show you how ( sig 522 new mag )