MCX-RATTLER LT UPPER ASSEMBLY - 6.75" 300BLK
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$1,799.99
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Aug 26, 2026
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Nearly 10 years ago the MCX LVAW was introduced and became the choice of Special Forces groups worldwide. With its 6.75" 300BLK design, the platform offered a replacement to sub-style platforms because of its ballistically advantageous caliber and a similar size footprint.Now for the first time since its inception, the MCX-RATTLER LT upper assembly offers the same design that changed a generation of rifles with updated features that make it better than ever.The MCX-RATTLER LT offers a 6.75" cold hammer forged barrel, compatibility with AR-style triggers, an adjustable gas system for suppressor optimization, a QD Clutchlok Muzzle Device and a M4 adapter kit to convert any M4 lower to utilize the folding capability of the MCX platform. Also, the new MCX-RATTLER LT design allows it to be compatible with all MCX-SPEAR LT parts, meaning any barrel or handguard from the MCX-SPEAR LT can interchange parts, allowing for easy caliber and length conversions. Advanced beyond any platform in its class, the MCX-RATTLER LT upper is the ultimate upgrade for your MCX or M4 lower.Features:Adapts with any M4/AR15 spec lower assemblyDual rod recoil assembly eliminates buffer systemM4 adapter allows for pic rail folding stock capabilitiesAdjustable gas system for suppressor optimizationQuick change barrel design allows to easily swap calibers and barrel lengthsGas piston design reduces part exposure to carbon foulingDesigned to go 20k rounds before any part replacementsSLX/SLH Next Gen Suppressor designed QD Flash Hider for Clutch-Lok adaptabilityAmbidextrous charging handle with gas deflectorReplaceable parts (cam path follower, feed ramp, forward assist/deflector, charging handle locking pins) allow for longer receiver life over standard AR designs.Tapered bolt design functions more reliably and lasts longer than standard square lug M4 bolt designs.Nitride coated cold hammer forged barrel for optimal accuracy and barrel lifeIncluded items:Complete 6.75" 300BLK upper assembly includes our removable 3-prong flash-hider ready to accept our SLH & SLX suppressor systems.Receiver extension delete stock adapter so you may mount any folding or static stock or brace that uses a vertical 1913 rail system. Shop SuppressorsShop 300BLK AmmoShop Stocks & Braces
