Spikes Tactical STU5035S2S Complete Upper 5.56 16″

Description

The Spikes Tactical STU5035S2S is a Mil-spec complete AR-15 upper built around a 16″ mid-length barrel and a free-floating 12″ SAR3 handguard. Components include a 1:7 twist barrel in a government profile with a black phosphate finish, a Spike’s Tactical Mil-Spec M16 bolt carrier group, and an ST Micro gas block with a .750″ gas seat. The upper is optic-ready with no fixed sights installed and is intended for range, duty, and precision-oriented use within the constraints of applicable laws and safe handling practices.

Key Specifications

• Chambered for 5.56x45mm NATO (.223 REM/5.56 NATO).
• The barrel measures 16″ and is configured for a mid-length gas system.
• The rate of twist is 1:7.
• The barrel construction is Chrome Moly.
• The barrel finish is Black Phosphate.
• The barrel uses a Gov’t profile.
• The gas system is a Mid-Length Gas System.
• The gas block is an ST Micro Gas Block with a .750″ diameter gas seat.
• The bolt carrier group is a Spike’s Tactical Mil-Spec M16 BCG.
• The handguard is a 12″ SAR3 free-floating unit and the receiver is 7075-T6 aluminum in black.

This complete upper brings a mil-spec parts set to a practical AR-15 platform, marrying a 16″ mid-length barrel and a 12″ free-floating SAR3 handguard for stable, controllable performance at the range. Its Mil-spec components and optic-ready configuration make it suitable for shooters who prioritize reliability and modularity in sport, training, or duty-style applications.