Sig Sauer MCX Spear LT 5.56 NATO 11.5" Barrel 10rd Magazine

The Sig Sauer MCX Spear LT delivers modern rifle performance in a compact 5.56 NATO platform engineered for versatility and reliability. This short-barreled rifle combines proven gas piston operation with contemporary manufacturing techniques to create a firearm that excels across multiple applications. The 11.5-inch barrel provides an optimal balance between maneuverability and ballistic performance.

What Makes This Different

Unlike traditional direct impingement systems, the MCX Spear LT utilizes a short-stroke gas piston that runs cooler and cleaner under sustained fire. The monolithic upper receiver eliminates the need for a separate handguard, creating a rigid platform that maintains zero through temperature changes and hard use. This design reduces overall system weight while increasing structural integrity compared to multi-piece upper assemblies.

Key Features

• Short-stroke gas piston system with adjustable gas block for reliable cycling
• Monolithic aluminum upper receiver with integrated Picatinny rail system
• 11.5-inch cold hammer-forged barrel with 1:7 twist rate for heavy bullets
• Ambidextrous controls including safety selector and magazine release
• M-LOK compatible handguard for direct accessory mounting
• Folding and telescoping stock for compact storage and transport
• Standard AR-15 trigger group compatibility for customization options

Field performance demonstrates consistent accuracy with match-grade ammunition achieving sub-2 MOA groups at 100 yards. The gas piston system cycles reliably with both standard and subsonic loads, making it suitable for suppressed applications. Weather sealing protects internal components from moisture and debris during extended outdoor use. The platform maintains functionality in temperature extremes from -40°F to 140°F.

Technical Specs

• Caliber: 5.56 NATO/.223 Remington
• Barrel Length: 11.5 inches with 1:7 twist rate
• Overall Length: 32.5 inches extended, 23 inches folded
• Weight: 7.2 pounds unloaded
• Magazine Capacity: 10 rounds (compliant configuration)
• Upper Receiver: 7075-T6 aluminum monolithic design
• Handguard: M-LOK compatible with Picatinny top rail
• Stock: Folding telescoping with adjustable length of pull
• Finish: Hard anodized aluminum with Cerakote coating
• Country of Origin: United States

This configuration meets legal requirements in restricted states while maintaining the performance characteristics that define the MCX platform. The 10-round magazine capacity and 11.5-inch barrel length provide compliance without sacrificing the reliability and accuracy that tactical professionals demand from their primary weapon system.