The Sig Sauer M400 Tread is a semi-automatic rifle chambered in 5.56 NATO with a 16-inch barrel in Black. It is offered in both 10-round and 30+1 configurations depending on the compliance variant. The M400 Tread is a production semi-automatic rifle in the M400 line. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: M400 Tread 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 10rd / 30+1 
• Barrel Length: 16 inches 
• Color/Finish: Black 
   

Detailed Features 

• Semi-automatic operation in 5.56 NATO 
• 16-inch barrel 
• Available in 10-round and 30+1 configurations 
• Black finish 
• M400 Tread furniture and grip configuration

Owners of the M400 Tread point to reliability as the primary reason for the purchase. The 5.56 NATO chambering with a 16-inch barrel is a well-established combination, and most owners report no issues through early range sessions. The Tread-specific furniture and grip texture get consistent positive feedback for feel and grip in varied conditions.

The trigger is functional but is often called the first upgrade candidate. Owners doing precise work tend to swap it; those running the rifle as a general utility firearm usually leave it alone. The 10-round compliance variant occasionally frustrates buyers who expected the standard 30+1 configuration, so verifying the SKU before ordering is worth doing.

The M400 Tread is generally viewed as a production semi-automatic rifle without surprises, which suits a specific type of buyer perfectly. Comparisons to other Sig offerings in the same category come up in owner discussions, and most feel the Tread delivers consistent value. Occasional mentions of finish showing wear earlier than expected appear, though these are not widespread complaints.