AR-15 uppers are often treated as plug-and-play, but correct assembly requires proper tools, correct specifications, and disciplined technique. This hands-on course focuses on assembling an AR-15 upper receiver correctly so it functions reliably and holds up over time.

The course walks through the tools required for proper assembly, how individual components are specified, and how those specifications change based on barrel length and gas system configuration. Particular attention is paid to correct installation methods and torque values to avoid common reliability and longevity issues.

Topics covered include:

• Required tools for upper receiver assembly
• Component specifications, including appropriate gas port sizing by barrel length and gas system
• Proper installation techniques and torque values
• Correct muzzle device installation based on intended use (e.g., flash hider vs suppressor mount)
• Characteristics of a quality bolt carrier group (BCG)

This course is instructional and technical in nature and is intended to give students a clear understanding of how and why upper receiver components are assembled the way they are.

Instructor Bio – Shep
Shep is TruPrep’s in-house armorer with deep experience across military, federal, and law-enforcement environments. At TruPrep, Shep serves as the primary armorer, responsible for evaluating rifle setups, correcting build issues, and performing modifications.  In addition to his roles at TruPrep, Shep provides training, armorer services, and technical support to various professional agencies. He is widely regarded locally for his attention to detail and his insistence on correct specifications, proper tooling, and disciplined assembly practices rooted in real-world operational use.