The Sig Sauer Sight Rail for M400 Tread (Sig Sauer part no. KIT-TRD-SIGHT-RAIL) is a genuine factory replacement rail section built for the M400 Tread rifle’s M-LOK handguard. Finished in black, this compact 4-slot Picatinny section gives shooters a factory-correct spot to remount a front sight, offset optic, or small accessory after removing or replacing handguard furniture. Because it’s Sig’s own replacement part, fit and slot spacing match the original rail exactly. It’s the simplest way to restore a lost or damaged sight rail segment on an M400 Tread build. Check out additional Sig Sauer gear in our catalog.

Key Specifications

• The rail mounts via M-LOK, matching the M400 Tread’s factory handguard attachment system.
• It carries a Picatinny slot pattern on top, giving a standard interface for sights and optics.
• Overall length is 1.9 inches, sized to add a short accessory or sight section without excess bulk.
• It functions specifically as a replacement sight rail segment, not a full-length handguard rail.
• It has 4 Picatinny slots, enough for a folding sight or small optic mount.

Frequently Asked Questions

Is this rail specific to the Sig M400 Tread? Yes, it’s a factory replacement sight rail built specifically for the M400 Tread’s M-LOK handguard.

How does it attach to the handguard? It mounts using the M-LOK attachment system standard on the M400 Tread’s handguard.

How many accessory slots does the rail have? It has 4 Picatinny slots on top for mounting a sight or small accessory.

Buy the Sig Sauer Sight Rail for M400 Tread

Replace a lost or damaged sight rail section with the exact factory part Sig built for the M400 Tread. Order it from our Lubbock, Texas gun shop for fast, insured direct shipping. Explore our other Scope Accessories & Scope Parts picks while you’re here.