Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float BAR2 Rail - STU5435-R2S
All Spike's Tactical upper receivers
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Spike's Tactical
Overview
The Spike's Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly is a fully assembled upper receiver designed for the AR-15 platform, featuring a 16-inch barrel that optimizes performance for 5.56 NATO ammunition. The black finish and durable 7075-T6 aluminum construction ensure both resilience and a sleek appearance. This upper assembly is commonly found in builds focused on 5.56 NATO caliber configurations, making it a solid choice for precision and reliability in that caliber.
Specifications
Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float BAR2 Rail - STU5435-R2S
Available Merchants(5)
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Build history on GunPartPicker
Builders on GunPartPicker first added the Spike's Tactical Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float BAR2 Rail - STU5435-R2S to a build in February 2026.
It was hard to find in September 2026, in stock on only 8 of the 24 days we checked, and today none of the 5 retailers we track has it in stock right now. It dipped to $691.53 at GritR Sports for a stretch in September 2026, well under its usual $788.40, so sales do come around. Listed prices start at $691.53 at GritR Sports for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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