Spikes ST-15 Complete AR-15 Upper 5.56 NATO 16 Inch Cold Hammer Forged Barrel Free Float Rail STU5435R2S

SKU: FLX-99748

Vendor Spikes
Regular price $782.98
Sale price $782.98 Regular price $868.70
Sale Sold out
Unit price
/per 
FREE GROUND SHIPPING on orders $50+
Additional or Expedited Shipping calculated at checkout.
This is a pre order item. We will ship it when it comes in stock.

Fast Shipping

American Owned

Easy Returns

Product Description

The Spikes ST-15 Complete Upper is a Mil-Spec compliant AR-15 upper assembly built for shooters who want dependable performance, durable materials, and a ready-to-install configuration. Chambered in 5.56x45mm NATO, this complete upper features a 16-inch cold hammer forged barrel with a black phosphate finish, a mid-length gas system, and a forged 7075-T6 aluminum receiver for strength and long service life. Its free-floating 12-inch handguard helps support consistent accuracy while providing ample space for accessories, and the included A2 flash hider delivers a proven muzzle setup. Designed to fit AR-15 platforms, this optic-ready upper is a strong choice for range use, training, and duty-style rifle builds.

Product Highlights

  • Complete AR-15 upper assembly chambered in 5.56x45mm NATO for reliable performance and broad ammunition compatibility.
  • 16-inch cold hammer forged barrel with black phosphate finish and 1:7 twist rate for durability and stabilization of a wide range of bullet weights.
  • Mid-length gas system with micro or low-profile gas block configuration helps promote smooth cycling and balanced recoil impulse.
  • Forged 7075-T6 aluminum upper receiver provides lightweight strength for hard use and long-term durability.
  • 12-inch free-floating handguard and A2 flash hider create a practical, optic-ready setup for modern AR-15 builds.

Specs

  • Brand: Spikes
  • Model: ST-15 Complete Upper
  • Manufacturer Part Number: STU5435R2S
  • UPC: 815648023331
  • Caliber: 5.56x45mm NATO
  • Compatible Platform: AR-15
  • Type: Complete Upper
  • Barrel Length: 16 in
  • Barrel Finish: Black Phosphate
  • Barrel Construction: Cold hammer forged, Mil-Spec
  • Barrel Profile: ST Optimum Profile
  • Twist Rate: 1:7
  • Gas System: Mid-length
  • Gas Block: ST Micro Gas Block
  • Gas Seat Diameter: .750 in
  • Receiver Material: 7075-T6 Aluminum
  • Receiver Finish: Black
  • Handguard: 12 in free-floating handguard
  • Muzzle Device: A2 Flash Hider
  • Thread Pattern: 1/2x28
  • Bolt Carrier Group: Spike's Tactical Mil-Spec M16 Bolt Carrier Group
  • Sights: Optic Ready
  • Weight: 4 lbs

Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.

The TLO Promise:

Customer Satisfaction Guaranteed

Fast Shipping

Most orders placed before 12 Noon (EST) ship same day and FREE SHIPPING on orders $50+

Easy Returns

No-Hassle Returns for 30 days from your purchase date.

Customer Service

TLO is a family-owned, American small business in GA. We treat you right.

Google Example // <- put this code in head section