SIG SAUER M400 TREAD M-LOK Sight Rail

SIG SAUER M400 TREAD M-LOK Sight Rail

The SIG SAUER TREAD Sight Rail is a factory replacement mounting section made for the M400 TREAD platform. It attaches to a compatible M-LOK handguard and provides a short Picatinny rail section for the rifle’s front sight. For an owner replacing a missing or damaged part, or completing a TREAD sight setup with the correct factory-style interface, this compact component offers a direct and purpose-built solution.

This listing is for SIG SAUER manufacturer part number KIT-TRD-SIGHT-RAIL, UPC 798681599004. SIG identifies it as a factory replacement sight rail for the M400 TREAD and includes the screws and nuts needed for mounting. Its black finish coordinates with the standard TREAD handguard and accessories.

Designed for the TREAD Sight Position

M-LOK handguards are versatile, but a flip-up front sight designed for a Picatinny interface still needs the correct rail section at the proper location. This TREAD rail bridges those two systems: its underside secures to the M-LOK slot, while the upper surface supplies the Picatinny mounting points used by the front sight. The compact format keeps the installation focused on the sight rather than adding unnecessary rail length along the handguard.

Key Features

• Factory SIG SAUER replacement sight rail for the M400 TREAD
• M-LOK mounting interface for a compatible handguard
• Short Picatinny section for mounting the TREAD front sight
• Black finish that matches common TREAD components
• Includes mounting screws and nuts
• SIG SAUER model designation: TREAD

Installation Notes

Before installation, confirm that the handguard has an open M-LOK slot at the intended sight location and that the sight and rail will share the correct sight plane. Unload and clear the firearm, follow the firearm and accessory manufacturers’ instructions, and use the supplied hardware. The fasteners should engage the M-LOK nuts correctly without contacting the barrel or gas system. After mounting, verify that the rail is secure and that the sight attaches squarely before zeroing.

This is a dedicated sight-rail component, not a full-length handguard rail and not the flip-up sight itself. If you are building a complete TREAD iron-sight arrangement, pair it with the appropriate front and rear sights and confirm compatibility with any optic, mount, or other accessory already installed.

What’s Included

• One SIG SAUER M400 TREAD sight rail
• Mounting screws
• M-LOK nuts

Choose this SIG SAUER factory sight rail when you need the correct M-LOK-to-Picatinny interface for the M400 TREAD front sight position, with the matching hardware included for a clean, compact installation.