Sig Sauer MCX Spear LT 5.56 NATO 11.5" Barrel 30rd Semi-Auto Rifle

The Sig Sauer MCX Spear LT delivers the proven reliability of military-grade piston-driven operation in a lightweight civilian platform. This 5.56 NATO rifle incorporates lessons learned from battlefield deployment while maintaining compatibility with standard AR-15 magazines and accessories.

What Makes This Different

Unlike traditional direct impingement systems, the MCX Spear LT uses a short-stroke gas piston that runs cleaner and cooler under sustained fire. The monolithic upper receiver eliminates the barrel extension found in AR-15 designs, creating a more rigid platform that maintains zero through temperature changes. Sig's proprietary barrel attachment system allows users to swap calibers and barrel lengths without specialized tools.

Key Features

• Short-stroke gas piston system reduces fouling and heat buildup
• 11.5-inch cold hammer forged barrel with 1:7 twist rate
• Monolithic aluminum upper receiver with integrated Picatinny rail
• Fully ambidextrous controls including bolt catch and magazine release
• 5-position adjustable folding stock for compact storage
• M-LOK compatible handguard with multiple attachment points
• Accepts standard AR-15 magazines and triggers

Field testing demonstrates consistent sub-2 MOA accuracy with quality ammunition, while the piston system maintains reliability through adverse conditions that challenge direct impingement rifles. The 11.5-inch barrel provides optimal velocity for 5.56 NATO while keeping overall length manageable for vehicle operations and close-quarters scenarios. Law enforcement agencies report excellent performance in urban environments where maneuverability matters.

Technical Specs

• Caliber: 5.56 NATO/.223 Remington
• Barrel Length: 11.5 inches
• Overall Length: 25.5-29.5 inches (stock extended)
• Weight: 7.2 pounds (unloaded)
• Magazine Capacity: 30 rounds (included)
• Trigger: Single-stage, 6.5-pound pull
• Rail System: M-LOK compatible aluminum handguard
• Stock: 5-position adjustable, side-folding
• Finish: Hard coat anodized aluminum, Nitride barrel
• Country of Origin: USA

Professional users choose the MCX Spear LT when mission requirements demand both reliability and adaptability. The combination of proven piston operation with modern manufacturing creates a platform that performs consistently across diverse operational environments.