The Spikes STU5435R2S Complete Upper 5.56x45mm NATO 16" Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12" SAR3 Free-Floating Handguard for AR-15 is built as a mil-spec compliant upper ready to drop onto your AR-15 lower. It pairs a 16" cold hammer forged midlength barrel with a black phosphate finish, a 12" SAR3 free-floating handguard, and a forged 7075-T6 aluminum receiver for a durable, smooth-running setup. The included Spike’s Tactical M16 bolt carrier group and A2 flash hider round out a reliable, optics-ready upper assembly.

This complete upper is well suited for range use, training, and general-purpose AR builds where shooters want dependable performance without extra tuning. The midlength gas system and ST Micro Gas Block help soften recoil and promote consistent cycling, while the free-floating SAR3 handguard offers ample mounting space for lights, grips, and other accessories. With its proven components and careful assembly, this upper reflects Spike’s Tactical’s reputation for solid craftsmanship and attention to detail.

Key Features:

• Manufacturer: Spikes Tactical
• Model: STU5435R2S Complete Upper
• Caliber: 5.56x45mm NATO / .223 Remington
• Barrel Length: 16" Midlength
• Barrel Finish: Black Phosphate
• Handguard: 12" SAR3 Free-Floating
• Receiver Material: 7075-T6 Aluminum
• Sights: None, Optic Ready
• Muzzle Device: A2 Flash Hider
• Twist Rate: 1:7" Cold Hammer Forged Barrel
• Bolt Carrier Group: Spike’s Tactical Mil-Spec M16 BCG