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