The Sig Sauer M400 Tread Enhanced 15" Black M-LOK Handguard HGRD-TRD-E15-MLOK-BLK is a factory replacement part designed specifically for the M400 TREAD rifle chambered in 5.56 NATO. It features a 15-inch free-floating design made from lightweight aluminum with a durable black anodized finish. The Sig Sauer HGRD-TRD-E15-MLOK-BLK handguard incorporates M-LOK slots for mounting accessories and lightening cuts to reduce overall weight. It also includes subtle branding with the TREAD logo and is secured using two hex screws for installation.