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Does anyone know if if the 15" will fit my Sig Sauer M400 Swat 5.56mm Tactical Rifle? Model#RM400-16B-S. Just not sure about the gastube/gasblock — 1 Answer

by Riv, from CA, United States Asked on December 21, 2021

Name Midwest Industries MI Ultra Lightweight One Piece Free Float Handguard (4.9)
As Low As $282.95 Save Up to $11.00
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Answered by Midwest Industries, Manufacturer from WI, United States, on December 30, 2021

This will work with a M400 upper. you will have to remove the front sight base and replace with a low profile gas block. We do not make a ultra lightweight hand guard short enough to fit behind a carbine length front sight tower.

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Last updated 2025-11-12 UTC.