Description
Equip your AR-15 with the professional-grade durability of the Spike's Tactical 16" 5.56 NATO Complete Upper Receiver Group (MPN: STU5435-MLS). Designed as a fully mil-spec compliant upper series to meet the strict demands of law enforcement duty, this complete upper receiver assembly combines premium cold hammer forged (CHF) barrel technology with classic carbine reliability—delivering an exceptional choice for any defensive setup, duty rifle, or hard-use training platform.
The standout feature of this upper is its 16-inch premium Cold Hammer Forged (CHF) barrel. Sourced from high-grade 41V50 chrome moly vanadium steel, this barrel is chrome-lined to demanding M249 SAW machine gun specifications, providing a massive 20,000+ round service life and extreme resistance to heat and throat erosion. It features an optimal Government profile, a versatile 1:7" twist rate to stabilize heavy defensive grain weights, and standard 1/2x28 muzzle threads topped with a classic A2 flash hider.
Engineered with a mid-length gas system, this setup yields a smoother recoil impulse, reduced internal pressure, and less component wear compared to traditional carbine-length systems. It utilizes an F-marked pinned A2 front sight base (FSB) alongside traditional, drop-in mid-length polymer handguards.
This drop-in ready assembly is built on a 7075-T6 forged flat-top upper receiver with laser-engraved T-markings and extended M4 feed ramps. It includes Spike’s Tactical Mil-Spec M16 Bolt Carrier Group (BCG)—which is high-pressure tested (HPT) and magnetic particle inspected (MPI) for absolute performance—and a forged mil-spec charging handle.
Key Features
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Premium CHF Barrel: Cold hammer forged and chrome-lined to machine-gun specs for matchless barrel life, accuracy, and heat handling.
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Smooth Mid-Length Gas System: Softens the recoil impulse and extends the operational longevity of internal parts.
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Duty-Ready Drop-In: Fully assembled, test-fired at the factory, and ships complete with an HPT/MPI M16 bolt carrier group and charging handle.
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Authentic F-Marked FSB: Pinned A2 front sight post offers a reliable, rugged indexing point for iron sights or absolute co-witness optics.
