Sig Sauer M400 Tread 13" M-LOK Handguard - Black Finish

The Sig Sauer M400 Tread 13" M-LOK handguard is a factory replacement rail system built for shooters who want to customize their M400 Tread platform rifle. Whether you're upgrading ergonomics, adding accessories, or refreshing a worn handguard, this black-finished M-LOK rail gives you a modular mounting solution that integrates seamlessly with your existing rifle. M-LOK slots run the length of the handguard, letting you mount lights, grips, rail segments, and other mission-specific gear exactly where you need it.

At 13 inches, this handguard strikes a practical balance for mid-length configurations—long enough for mounting flexibility without unnecessary weight or unwieldy length. The M-LOK standard has become the go-to for modern AR builds because it's lightweight, fast to use, and compatible with a huge ecosystem of accessories from major manufacturers. Unlike picatinny rails that add bulk, M-LOK keeps your profile clean while delivering the attachment points that matter.

This is a factory Sig part, so fit and finish are guaranteed. Installation uses your existing hardware, making the swap straightforward for anyone comfortable working on their rifle. The black finish matches standard M400 Tread rifles and blends with common carbine setups.

Key Features

• 13-inch length optimized for mid-length build configurations
• M-LOK slot pattern for lightweight, modular accessory mounting
• Factory Sig Sauer OEM part engineered for M400 Tread compatibility
• Black finish
• Uses existing hardware for installation

Specifications

Frequently Asked Questions

Will this handguard fit my M400 Tread?

Yes—this is a factory Sig Sauer replacement handguard engineered specifically for the M400 Tread platform.

Do I need new hardware to install it?

No. This handguard uses your existing mounting hardware, so installation is straightforward.

What accessories can I mount on M-LOK?

M-LOK is an industry-standard system compatible with lights, vertical grips, rail sections, sling mounts, and other tactical accessories from most major manufacturers. Check your accessory's specs to confirm M-LOK compatibility.