Spikes Tactical STU5025M4S 5.56 NATO 16″ Complete Upper

The Spikes Tactical STU5025M4S is a complete AR-15/M16 upper receiver designed for carbine-length applications. It is chambered for .223 Rem / 5.56 NATO and features a 16" chrome moly barrel with a black phosphate finish and a 1:7 rate of twist. The assembly includes a 7075-T6 aluminum black receiver and Mil-spec M16 bolt carrier group for parts interchangeability. Components adhere to Mil-spec standards for use in range, training, and duty environments.

Key Specifications

• The caliber/cartridge is .223 Rem / 5.56 NATO.
• The barrel measures 16 inches.
• The barrel finish is Black Phosphate.
• The barrel material/description is Chrome Moly.
• The rate of twist is 1:7.
• The receiver material is 7075-T6 Aluminum (black).
• The handguard type is M4 Double Head Shield Handguard.
• The gas system is Carbine length.
• The front sight included is a F-marked A2 front sight base.
• The muzzle device is an A2 flash hider.

Built to Mil-spec standards and finished for durability, the STU5025M4S delivers a service-oriented upper that integrates with common AR-15 platforms. Its 16-inch profile, carbine gas system, and standard sighting components make it a straightforward choice for shooters seeking a dependable, parts-compatible upper for range work, training, or duty-style applications.