This SIG Sauer M-LOK handguard (brand part number HGRDTRDE13MLOKBLK) is the factory-spec 13-inch replacement handguard for the M400 Tread rifle, built as a free-float design with lightening cuts to keep weight down without sacrificing rigidity. Machined from black aluminum, it uses a two-screw mounting system that matches the original Tread handguard, so it swaps on without any additional fitting. The M-LOK slots run the full length of the handguard, giving Tread owners a straightforward way to add lights, grips, and other accessories directly to the rail.

Key Specifications

• Factory-spec replacement for the SIG M400 Tread rifle.
• Measures 13 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

Does this handguard fit any AR-15? It’s a factory-spec replacement built specifically for the SIG M400 Tread.

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, 13-Inch, Black Aluminum

A free-float handguard with full-length M-LOK is one of the easiest upgrades for a Tread owner who wants factory fit without factory limitations. 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.