The Sig Sauer M400 Tread V2 is an AR-pattern semi-automatic rifle chambered in 223/5.56 with a 16-inch stainless steel barrel and a muzzle brake. It has an M-Lok free-float handguard, a Matchlite 2-stage trigger, a Magpul MOE stock, and a CA compliant grip. This version is California compliant and holds 10 rounds. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: M400 Tread V2 
• Caliber: 5.56 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 16 inches 
• Color/Finish: Black 
   

Detailed Features 

• 16-inch stainless steel barrel with muzzle brake 
• M-Lok free-float handguard 
• Matchlite 2-stage trigger 
• Magpul MOE stock with CA compliant grip 
• California compliant configuration, 10-round capacity

Owners of the M400 Tread V2 generally praise the Matchlite 2-stage trigger as the highlight of the package, calling it a meaningful upgrade over what typically ships in this price range. The stainless steel barrel and M-Lok free-float setup give a solid base for building out the rifle with minimal modification.

The CA compliant grip draws the most consistent complaints. Buyers outside California who receive a CA configuration are often frustrated, and even California-based owners acknowledge the grip limits the ergonomics compared to a standard configuration. The Magpul MOE stock is well-regarded on its own.

Value opinions vary. Shooters who prioritize the trigger and want a ready-to-run platform from the factory view the M400 Tread V2 as solid at its price point. Those who plan to replace the grip and other furniture immediately question whether the CA-spec version is the right starting point for their build.