Product Overview
The SIG SAUER MCX SPEAR-LT IR 5.56 rifle represents a precisely engineered carbine platform, exhibiting a balanced configuration for demanding operational requirements. Chambered in 5.56x45mm NATO, this rifle features a 16-inch barrel, providing optimal ballistic characteristics and practical maneuverability across diverse applications, from competitive shooting to defensive engagements. The SPEAR-LT variant integrates specific design modifications to significantly reduce weight while enhancing modularity, delivering a robust yet highly manageable firearm.
Key Features
Operating System
The rifle employs a proven short-stroke gas piston operating system. This design promotes consistent, reliable cycling and effectively mitigates carbon fouling in the receiver, thereby extending intervals between maintenance and enhancing system longevity.
Construction & Ergonomics
The MCX SPEAR-LT IR incorporates a refined receiver profile and a slim, M-LOK compatible handguard, collectively reducing overall system mass. This optimization contributes to superior handling dynamics and reduced operator fatigue during extended periods of use. The rifle’s Coyote finish provides a durable, non-reflective surface treatment engineered for harsh environmental conditions and reduced visual signature.
Adaptability & Utility
Engineered for intrinsic adaptability, the MCX SPEAR-LT IR facilitates extensive user configuration. Its design accommodates a broad spectrum of firearm accessories and stock options, allowing specific customization to meet individual operational demands. The platform’s construction ensures secure integration of tactical optics and other mission-critical equipment, validating its suitability for rigorous training regimens and field deployment.
Technical Specifications
- Caliber: 5.56x45mm NATO
- Barrel Length: 16 inches
- Operating System: Short-Stroke Gas Piston
- Handguard: M-LOK Compatible
- Finish: Coyote









