When selecting an upper receiver for duty or range use, reliability built to Mil‑Spec standards separates field‑ready systems from the rest. A carefully engineered upper ensures consistent gas flow, durable components, and compatibility with a wide range of lower receivers and accessories.
SPIKE’S TACTICAL ST-15 UPPER RECEIVER is a purpose-built Mil‑spec upper line designed originally for law enforcement and now offered at a price point accessible to everyday shooters. The package centers on a 16″ 1:7 twist Mil‑spec barrel with an M4 barrel profile and carbine length gas system—features that deliver proven performance across a variety of loads and mission sets. 
Design and Mil‑Spec Features
This upper is fully Mil‑spec compliant: each component is manufactured to exacting standards. Key details include the ST Micro Gas Block paired to a .750″ diameter gas seat for stable, repeatable gas delivery and reduced dwell sensitivity. The included Spike’s Tactical Mil‑Spec M16 Bolt Carrier Group ensures proper headspace and robust extraction under sustained fire.
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Barrel, Gas System, and Muzzle
The 16″ 1:7 twist barrel favors stabilization of heavier projectiles while remaining competent with lighter match and FMJ rounds, making it versatile for both precision and duty applications. The M4 barrel profile balances weight and stiffness, while the carbine length gas system smooths recoil impulse and timing for controllable follow‑up shots. The A2 flash hider provides a reliable, service‑grade muzzle device.
Price is competitive at $725.99, reflecting the inclusion of Mil‑spec components and the ST BAR rail system—an integration that allows straightforward accessory mounting without compromising the upper’s durability. View product details and pricing
Applications and Compatibility
Whether assembling a duty rig, building a budget‑minded precision platform, or upgrading a training carbine, this upper aligns with AR‑15 mil‑spec standards for drop‑in compatibility. The choice of a 1:7 twist makes it particularly suitable for users planning to shoot heavier bullets for extended‑range work, while the carbine gas system and ST Micro Gas Block help maintain reliability across suppressed and unsuppressed configurations.
For a Mil‑spec upper that blends proven components with an approachable price, the SPIKE’S TACTICAL ST-15 UPPER RECEIVER is a practical choice. Check current availability and purchase options on our shop page to confirm stock and compatible configurations. Check current availability
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People Also Ask
What makes this product stand out from competitors?
This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.
Is this product suitable for beginners?
Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.
What warranty or support is available?
The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.
How does this compare to similar products in its price range?
This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.
What maintenance is required?
Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.
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