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Gary, yes sir, this will fit and function just fine. Magpul pmags are one of the best AR-15 magazines I've found and pretty sure what sig includes with the Sig M400 Tread Nato 556. Hope this helps.

Hi Gary and welcome to the Buds Community. This will fit without issue. I happen to use the M2 Magpul and the M3 PMag in Black in my Tread and have no issues (the M3's drop free slightly better than the M2's): Cheers and stay safe!

Yes sir. This would be good to run!!! Send it!!!!

Gary, yes sir, these will 100% work in your Tread, you can't go wr0ng with Magpul. Stay safe & have a great day!