Description
The SIG Sauer MCX Spear LT 11.5" 5.56 NATO Upper brings the pinnacle of short-stroke gas piston technology to your preferred carbine configuration. Purpose-built to deliver maximum maneuverability without sacrificing velocity, this complete upper receiver assembly features an 11.5-inch barrel finished in a sleek, tactical black anodizing.
Designed to drop directly onto any standard AR-15 lower receiver using the included conversion kit, this assembly offers military-grade durability, enhanced weight distribution, and absolute reliability for close-quarters training or duty use.
Advanced Piston Engineering and Improved Handguard Rigidity
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Short-Stroke Gas Piston System: By venting hot gases and carbon fouling out of the forward gas block instead of into the action, the upper runs cooler, cleaner, and with significantly higher reliability during high-volume strings of fire.
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Adjustable Gas Regulator: Features an easily accessible gas valve, allowing you to quickly tune the gas pressure to ensure smooth cycling whether shooting unsuppressed or hosting a silencer.
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Enhanced Handguard Rigidity: The Spear LT platform features an improved, rock-solid handguard attachment method that eliminates flex, ensuring your forward-mounted lasers, night vision illuminators, and iron sights maintain a precise zero under hard field use.
The 11.5-Inch Ballistic Sweet Spot
For a 5.56mm platform, an 11.5-inch barrel is widely regarded by tactical professionals as the ultimate balance for short-barreled setups. It yields significantly better dwell time, reliable cycling, and higher muzzle velocity compared to shorter 10.3-inch variants, while remaining incredibly compact for vehicle operations or tight spaces. The cold hammer-forged barrel comes capped with a SIG Sauer quick-detach flash hider, making it seamlessly compatible with SLX and SLH series suppressors.
