Spikes Tactical STU5025M4S | 5.56 NATO 16″ Complete Upper

The Spikes Tactical STU5025M4S is a complete AR-15 upper designed around a 16″ Black Phosphate chrome-moly barrel with a 1:7 twist, built to Mil-Spec dimensions for reliable service. It combines a carbine-length gas system and M4 barrel profile with a 7075-T6 aluminum receiver and M4 double heat-shield handguard for conventional AR-15 configurations. The assembly includes an F-marked A2 front sight base and a Spike’s Tactical Mil-Spec M16 bolt carrier group for standard compatibility. Applications for this upper include range and tactical training and law-enforcement/duty-style use where Mil-Spec components are preferred.

Product Specifications

• The barrel length is 16 inches.
• The cartridge is .223 REM/5.56 NATO.
• The barrel finish is Black Phosphate.
• The barrel material/description is Chrome Moly.
• The rifling twist rate is 1:7.
• The handguards are M4 Double Heat Shield.
• The overall finish is Anodized.
• The sights include an A2 Front sight base.
• The product type is a Complete upper assembly.
• The manufacturer is Spikes Tactical.
• The receiver material is 7075-T6 Aluminum.
• The bolt carrier group is a Spike’s Tactical Mil-Spec M16 BCG.
• The gas system is Carbine Length.
• The front sight base is F-marked A2.
• The UPC is 815648021030.

This STU5025M4S upper pairs Mil-Spec fitment with practical features for shooters who prefer proven AR-15 components. Its 16″ chrome-moly barrel and M4 handguard layout make it a straightforward choice for range-focused builds and professional training rigs where durability and parts compatibility matter.