Spike's Tactical115744861
Spikes STU5435MLS AR-15 Complete Upper 5.56 NATO 16" Midlength Barrel, 7075-T6 Aluminum Receiver, 12" SAR3 Handguard - Black$630.00
Availability: In Stock
The Spikes STU5025R9S complete upper is a factory-inspected, ready-to-run upper receiver assembly built on a 7075-T6 aluminum forging and paired with a 16-inch 5.56x45mm NATO barrel in black phosphate. This is the core you need for a fast, accurate M4 carbine build—drop it onto your lower receiver and you're armed. Spikes assembles and test-fires every upper before it ships, so you're getting a vetted component, not a dice roll.
The 9-inch BAR2 free-float handguard decouples from the barrel, eliminating harmonics that can throw your shots off-target, while the M4 profile barrel strikes the balance most shooters want: light enough to handle all day, stiff enough to keep groups tight from 0 to 300 yards and beyond. The forged upper receiver meets military-spec tolerances, and the black phosphate finish on the barrel resists corrosion in field conditions without adding bulk.
Whether you're a competitive shooter, a hunter who values reliability over mall-ninja features, or someone building a rifle to last, this complete upper gives you quality craftsmanship and function without the hype. Install it, run it, trust it.
| Model | STU5025R9S |
| Caliber | 5.56x45mm NATO |
| Barrel Length | 16 inches |
| Barrel Profile | M4 |
| Barrel Finish | Black Phosphate |
| Upper Receiver Material | 7075-T6 Aluminum |
| Upper Receiver Finish | Black Anodized |
| Handguard | 9-inch BAR2 Free-Float |
| Bolt Carrier Group | M16 Complete |
| Configuration | Complete Upper Assembly |
Yes. This Spikes complete upper is compatible with standard M4 lower receivers. Pair it with any mil-spec lower and you have a functional rifle.
Yes. The STU5025R9S ships with an M16 complete bolt carrier group, so you have everything needed for the upper assembly to run.
The 9-inch BAR2 free-float handguard isolates the barrel from the upper receiver. This reduces vibration and harmonics during firing, which typically improves accuracy by letting the barrel shoot more consistently.
Yes. Spikes test-fires every complete upper before shipment to verify function and reliability.
SKU: 121685874 • Width: 5in • Height: 3.5in • Depth: 26.5in • Weight: 5.31oz
Availability: In Stock
The Spikes STU5025R9S complete upper is a factory-inspected, ready-to-run upper receiver assembly built on a 7075-T6 aluminum forging and paired with a 16-inch 5.56x45mm NATO barrel in black phosphate. This is the core you need for a fast, accurate M4 carbine build—drop it onto your lower receiver and you're armed. Spikes assembles and test-fires every upper before it ships, so you're getting a vetted component, not a dice roll.
The 9-inch BAR2 free-float handguard decouples from the barrel, eliminating harmonics that can throw your shots off-target, while the M4 profile barrel strikes the balance most shooters want: light enough to handle all day, stiff enough to keep groups tight from 0 to 300 yards and beyond. The forged upper receiver meets military-spec tolerances, and the black phosphate finish on the barrel resists corrosion in field conditions without adding bulk.
Whether you're a competitive shooter, a hunter who values reliability over mall-ninja features, or someone building a rifle to last, this complete upper gives you quality craftsmanship and function without the hype. Install it, run it, trust it.
| Model | STU5025R9S |
| Caliber | 5.56x45mm NATO |
| Barrel Length | 16 inches |
| Barrel Profile | M4 |
| Barrel Finish | Black Phosphate |
| Upper Receiver Material | 7075-T6 Aluminum |
| Upper Receiver Finish | Black Anodized |
| Handguard | 9-inch BAR2 Free-Float |
| Bolt Carrier Group | M16 Complete |
| Configuration | Complete Upper Assembly |
Yes. This Spikes complete upper is compatible with standard M4 lower receivers. Pair it with any mil-spec lower and you have a functional rifle.
Yes. The STU5025R9S ships with an M16 complete bolt carrier group, so you have everything needed for the upper assembly to run.
The 9-inch BAR2 free-float handguard isolates the barrel from the upper receiver. This reduces vibration and harmonics during firing, which typically improves accuracy by letting the barrel shoot more consistently.
Yes. Spikes test-fires every complete upper before shipment to verify function and reliability.
SKU: 121685874 • Width: 5in • Height: 3.5in • Depth: 26.5in • Weight: 5.31oz