Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float SAR3 Rail - STU5035-S2S
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 and a mid-length gas system. This setup provides a balance between reliability and recoil management, making it suitable for a variety of shooting applications. With a black finish and a 12" free float SAR3 rail, this upper is commonly found in builds that prioritize versatility and performance, particularly in configurations chambered in 5.56 NATO.
Specifications
Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float SAR3 Rail - STU5035-S2S
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Build history on GunPartPicker
Builders have been adding the Spike's Tactical Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, 12" Black Free Float SAR3 Rail - STU5035-S2S to their builds on GunPartPicker since March 2026. All time, it ranks #645 of the 1,683 upper receivers builders have added.
It was out of stock everywhere we track for all of September 2026, and today the one retailer we track is out of stock. Listed prices start at $867.99 at KY Gun Company for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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