This guide details the initial steps for building an accurate AR-15 upper receiver, focusing on critical inspection and assembly techniques. Instructor Caleb from Brownells emphasizes meticulous inspection of the upper receiver and barrel, proper lapping of the receiver face for squareness, and precise torquing of the barrel nut to ensure a tight, accurate fit. The process covers installing the barrel, adjustable gas block, handguard, and muzzle device, highlighting key torque values and potential pitfalls that can affect accuracy.
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