The Sig Sauer® M400 Tread M-LOK Handguard is a factory replacement handguard for Sig M400 Tread rifles featuring lightweight aluminum construction for superior strength with a black anodized finish for long-lasting corrosion-resistance in virtually any tactical environment.  Lightening cuts help heat dissipation during all-day range sessions and help reduce weight for steadier aim while the M-Lok design makes for more stable accessory mounting. This free-floating handguard features an easy-to-install design and is engineered to sustain serious operational abuse making it the ideal addition to your M400 Tread rifle. Included are two hex screws. Order today!