This SIG Sauer M-LOK handguard (brand part number HGRD-TRD-E15-MLOK-BLK) is the factory-spec 15-inch replacement handguard for the M400 Tread rifle, built as a free-float design with lightening cuts to keep weight manageable on a longer handguard. Machined from black aluminum, it uses the same two-screw mounting system as the factory Tread handguard, so it installs without additional fitting. Full-length M-LOK slots give Tread owners room to run a longer light, foregrip, or bipod farther out on the rail than the factory 13-inch option allows.

Key Specifications

• Factory-spec replacement for the SIG M400 Tread rifle.
• Measures 15 inches long.
• Uses a free-float design for improved accuracy potential.
• Machined from black aluminum.
• Features lightening cuts to reduce weight.
• Mounts with a two-screw attachment system.
• Uses M-LOK slots for mounting accessories.

Frequently Asked Questions

How is this different from the 13-inch version? It’s the same free-float design and mounting system, just 2 inches longer for more accessory real estate.

Is it free-floating? Yes, it’s a free-float handguard with lightening cuts to reduce weight.

What accessory mounting system does it use? It uses M-LOK slots along its length.

Buy the SIG Sauer M400 Tread M-LOK Handguard, 15-Inch, Black Aluminum

The extra 2 inches over the factory 13-inch option gives a Tread owner more room to run lights, grips, and a bipod together. Grab this SIG Sauer handguard along with anything else in our AR handguards lineup, and order from our Lubbock, Texas gun shop for fast, insured shipping.