The lower receiver is the foundation of the AR-15 system, and incorrect component selection or assembly can lead to reliability, recoil, and cycling problems. This course focuses on assembling an AR-15 lower receiver using correct tools, specifications, and techniques.

Students will learn how lower receiver components interact with caliber, barrel length, and gas system configuration, with specific emphasis on buffer system selection and setup. Proper installation methods and torque values are covered to ensure safe, consistent operation.

Topics covered include:

• Required tools for lower receiver assembly
• Component specifications, including proper buffer system matching to caliber, barrel length, and gas system
• Evaluation of buffer systems for different intended uses
• Proper installation techniques and torque values for lower receiver components

This course is designed to give students a solid technical understanding of lower receiver assembly and configuration decisions.

Course Instructor

Rob Sheppard is the firearms manager and resident armorer/gunsmith at TruPrep.  Among his Armorer certifications are Colt M16/AR15, Semper Paratus Arms AR, Sons Of Liberty Gun Works AR, SIG Sauer, Heckler & Koch, Remington, Smith & Wesson, and Beretta.  He works on a wide array of firearms and systems not covered on that list.   Shep is also the owner and chief instructor of Precision Applications, LLC, a full-line firearms and tactics training company.   A former United States Marine and SWAT Sniper for the Marietta Police Department, Shep also served as a Federal Air Marshal.  While serving in these capacities, he was an Instructor for Firearms and Tactics.  Shep is currently a reserve Police Captain.   With instructor certifications in a wide range of firearms, Use of Force, Team/Individual Tactics, and Less Lethal, Shep brings unparalleled expertise to TruPrep and is highly respected in his field.