The modern shooter needs an upper receiver that balances mil-spec reliability with practical features for duty or range use. Whether you are building a patrol rifle or upgrading a personal carbine, a proven upper saves time and delivers predictable performance when it matters most.
SPIKE’S TACTICAL ST-15 UPPER RECEIVER is built to that standard, offering a fully Mil-spec compliant upper series originally designed for law enforcement and now accessible to civilian shooters at a competitive price point. 
Key features and what they mean on the range
This ST-15 upper ships with a Spike’s Tactical 16″ 1:7 twist Mil-spec barrel in an M4 barrel profile and a carbine length gas system. The 1:7 twist is optimized for stabilizing heavier bullets, improving accuracy for a broader range of loads. The carbine gas length paired with the .750″ diameter gas seat and ST Micro Gas Block provides reliable cycling with minimal dwell variance and cleaner operation.
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Components built to mil-spec standards
Every component is manufactured to Mil-spec tolerances. The ST BAR rail system gives a robust mounting platform for optics and accessories while keeping weight manageable. The package includes a Spike’s Tactical Mil-Spec M16 Bolt Carrier Group and an A2 flash hider—components chosen for durability and compatibility with standard parts and accessories.
Shop this product to view the full spec sheet and confirm fitment for your build.
Fitment, applications, and value
The M4 profile 16″ barrel in this upper makes it a versatile choice for patrol-style rifles, competition where maneuverability matters, or a general-purpose AR build. Spike’s Tactical is notable for delivering law-enforcement-grade manufacturing practices to the broader market—this model is available at a price of $725.99 that places mil-spec quality within reach of many shooters.
Why choose this upper
If you require predictable gas management, proven bolt carrier components, and a solid rail platform for sights and accessories, the ST-15 checks those boxes while remaining straightforward to integrate with most mil-spec lower receivers and parts kits.
View product details and pricing to confirm current availability and accessories that complement the upper.
Final considerations before you buy
Confirm gas system length and barrel profile compatibility with your intended use, and ensure your lower is mil-spec to avoid fitment issues. For shooters seeking a duty-grade, affordable mil-spec upper, SPIKE’S TACTICAL ST-15 UPPER RECEIVER delivers a balanced package. Check current availability and purchase through the shop page where the retailer provides buying options and checkout.
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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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