The Sig Sauer MCX Spear-LT is an AR-pattern semi-automatic pistol chambered in 5.56 NATO with an 11.5-inch barrel and a 30-round capacity. It ships in a Coyote Cerakote finish with a folding brace and polymer grips. This configuration is built around the MCX platform with the IR-designated variant. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: MCX Spear-LT 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Barrel Length: 11.5 in 
• Capacity: 30+1 
• Color/Finish: Coyote Cerakote (FDE) 
   

Detailed Features 

• 11.5-inch barrel with a folding brace configuration 
• Coyote Cerakote finish 
• 30-round magazine 
• Polymer grips 
• Semi-automatic AR-pattern operation in a pistol configuration

Owners of the MCX Spear-LT frequently cite the folding brace as the standout practical feature, noting it makes storage and transport more compact than a fixed-stock rifle. The Coyote Cerakote finish is appreciated for corrosion resistance and the low-visibility color.

The 11.5-inch barrel is a compromise that divides buyers. Those running it suppressed find the shorter barrel ideal for overall length. Those shooting unsuppressed note increased concussion and muzzle blast compared to 14.5 or 16-inch configurations, especially indoors or at close-range bays.

The MCX Spear-LT carries a premium price for the platform, and owners generally feel the build quality justifies it. A recurring comment is that the proprietary MCX buffer system and folding mechanism are well-executed but limit compatibility with standard AR-15 parts, which some find limiting for customization.