Spike's Tactical STU5025-M4S Upper 5.56 NATO 16"
Mil-spec complete upper receiver with 16" barrel, M4 profile, carbine-length gas system, and M4 double heat shield handguard. Built to law enforcement standards at an accessible price.
Fits: AR-15
Spike's Tactical STU5025-M4S Upper Receiver
This complete upper receiver assembly represents genuine military-specification quality at a price point accessible to shooters of any experience level. Spike's Tactical has distilled their law enforcement-grade ST-15 upper line into a package that delivers reliable performance without compromise.
Key Features
Barrel & Gas System
- 16" Mil-spec barrel with M4 profile
- 1:7 twist rate for excellent velocity and bullet stabilization
- Carbine-length gas system for balanced reliability and handling
- .750" diameter gas seat for proper component fit
- F-marked A2 front sight base for traditional sight picture
- A2 flash hider to reduce muzzle signature
Receiver & Bolt Carrier Group
- 7075-T6 aluminum receiver in black phosphate finish
- Spike's Tactical Mil-spec M16 bolt carrier group for proven durability
- Every component manufactured to military specifications
Handguard
- M4 double heat shield design protects your hands during sustained fire
- Proven ergonomics and mounting compatibility
The Practical Advantage
This upper is ready to mount on any standard AR-15 lower receiver. Whether you're building your first rifle or adding to an existing collection, you're getting components that have proven themselves in demanding environments, now available at a price that makes sense for serious shooters.
