A factory SIG SAUER handguard in the Gen 2 lightweight short configuration, finished in Flat Dark Earth and specified for 300 BLK builds. Genuine SIG components fit and finish correctly against SIG uppers and barrel nuts — something aftermarket rails frequently do not, particularly on the MCX family where the handguard interfaces with a proprietary barrel nut rather than a standard AR one.

SIG part number 8901759, UPC 798681709212.

Why Caliber-Specific

SIG builds handguards to caliber-specific specifications within a platform because the barrel profile, gas block location, and suppressor clearance differ between chamberings. A rail cut for 300 BLK accounts for the larger-diameter barrel and the suppressor use case that most 300 BLK builds are designed around.