Sig Sauer M400 Tread Enhanced 15in MLOK Handguard - Sig Sauer M400 Tread Enhanced Handguard, MLOK is made from lightweight aluminum, this M-LOK free float handguard features lightening cuts, black anodized finish and TREAD logo. The handguard is a direct factory replacement for the Sig Sauer M400 TREAD rifle chambered in 5.56 NATO. TREAD by Sig Sauer is the only AR platform in its class that gives you the freedom to go beyond the standard. Includes Barrel Nut, Barrel Nut Wrench, Installation Hardware, Loaded with top-tier features M-LOK: Compatible with all M-LOK rail systems Lightening Cuts: Reduce weight while increasing accuracy Easy Installation: Quickly move between TREAD free-float handguards by removing two hex screws Made in the U.S.A.