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No, this is designed for use with Milspec AR15's only. Not 308s.
Yes, the Midwest Industries 14in Combat Rail T-Series One Piece Free Float Handguard will fit and function as intended with your Sig M400. It will include the barrel nut, mounting hardware, and wrench required for installation.
No, you would need to replace the factory gas block with a low-profile unit.
It’s a handguard, so it doesn’t matter.