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Mark, yes sir, this will fit and function just fine on a sig M400 tread. Hope this helps.

Hi Mark and welcome. Yes Sir. It is at the proper height and will co-witness with the Sig M400 tread sights. Cheers and stay safe!

Mark, yes sir, this will fit the M400 Tread and any other gun with a picatinny rail. This is a good choice. Stay safe & have a great day!