.338 ARC 12.5" Assembled Upper – Built for Performance
Our .338 ARC 12.5" Assembled Upper isn't just a collection of parts—it's a purpose-driven build assembled with quality components and attention to detail. Featuring a Ballistic Advantage 12.5" barrel and a Mil-Spec upper receiver, this upper is designed to provide a solid combination of reliability, accuracy, and versatility.
We use quality components from established manufacturers rather than generic, untested parts. More importantly, we take the extra steps during assembly to help ensure the components work together as intended.
Assembly & Quality-Control Process
Mil-Spec upper receiver
Ballistic Advantage 12.5" barrel
Receiver inspection and alignment
Proper Mil-Spec torque procedures
Headspace verification
Barrel installation and inspection
Gas system inspection and adjustment
Live-fire function testing
Many budget builds simply assemble the components and ship them. Our approach focuses on proper assembly, inspection, and function testing to help identify potential issues before the upper leaves our shop.
Is This a True Subsonic/Supersonic Setup?
Yes. The .338 ARC is designed to accommodate both subsonic and supersonic ammunition. With the appropriate ammunition and properly configured gas system, the platform can provide versatility across different applications.
Our build incorporates an adjustable gas system and a properly matched operating setup to help optimize cycling. As with any .338 ARC setup, ammunition selection and individual rifle configuration can affect performance and may require tuning.
Why Is This Considered "Mid-Tier"?
This build is designed to provide quality components and professional assembly practices without the price of a fully custom build.
You're getting a Ballistic Advantage barrel, Mil-Spec upper receiver, carefully selected components, proper assembly procedures, inspection, and live-fire function testing—all without paying the premium associated with a boutique custom build.
The result is a well-built, upgrade-friendly .338 ARC upper designed for shooters who want quality and performance without unnecessary expense.
Quality components. Proper assembly. Real-world testing. Built by Patriot Arms and Supply.
