Spikes STU5025R9S Complete Upper 5.56 NATO 16″ Barrel, 9″ BAR2

The Spikes Tactical STU5025R9S is a complete upper assembly built to mil-spec tolerances for AR-style rifles. It pairs a 16″ chrome-moly barrel finished in black phosphate with a 9″ BAR2 free-float handguard and a 7075-T6 aluminum black receiver for a durable, serviceable configuration. Components arrive inspected and tested and are intended to drop into a compatible M4 carbine lower without additional modification. The assembly is optic-ready and ships without sights.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• The barrel measures 16 inches and uses a carbine-length gas system.
• The barrel material is chrome-moly with a black phosphate finish.
• The rate of twist is 1:7.
• The handguard is a 9″ BAR2 free-float configuration with quad-rail accessories noted.
• The receiver is 7075-T6 aluminum in black finish.
• Sights are listed as None, optic ready.
• The assembly includes Mil-Spec M16 bolt carrier group components per product details.
• The product type is a complete upper receiver assembly.
• The fit is specified for AR rifles designed for M4 carbine compatibility.

Designed to provide a straightforward upgrade or replacement upper, the STU5025R9S balances mil-spec construction with a compact free-float handguard and proven barrel configuration. Its components suit a range of practical applications from general-purpose shooting to duty-style configurations where durability and parts compatibility matter.