Sig Sauer M400 TREAD 4-Slot M-LOK Picatinny Sight Rail

Factory replacement sight rail for the Sig Sauer M400 TREAD designed to add a short Picatinny section to an M-LOK compatible handguard. The rail provides four Picatinny slots in a compact footprint and is finished in black. It is intended for use on the M400 TREAD platform but can be mounted on other M-LOK handguards where dimensions permit.

Key Specifications

• The model is Sight Rail.
• The kit contains 1 piece.
• The rail style is Picatinny.
• The mount type is M-LOK.
• The slot count is 4 Picatinny slots.
• The listed material is Steel.
• The listed finish is Aluminum (reported value).
• The overall length is 1.90 inches.
• The color is Black.
• Fitment is specified as Fits M-LOK.

This factory Sig Sauer sight rail provides a compact, OEM-compatible Picatinny section for the M400 TREAD, delivering a low-profile option for front sight placement or short accessory mounting. Its small footprint and M-LOK interface make it a practical replacement or add-on for owners seeking a factory-style rail section that integrates cleanly with the platform.