“Mil-spec vs commercial” is one of the most repeated distinctions in the AR platform—and one of the...
Author - Upper Authority Editorial Team
Bolt Carrier Group Parts: Complete Breakdown and Function
The bolt carrier group is the central moving assembly inside the AR platform. It handles locking...
How the Bolt Carrier Group Works: A Clear Breakdown
The bolt carrier group (BCG) is the mechanical core of the AR-15 platform. It controls firing...
How an AR-15 Works: Complete Cycling Process Explained
An AR-15 works by using gas pressure from a fired cartridge to cycle its internal components, eject...
AR-15 Parts List: Complete Breakdown of Every Component
Understanding an AR-15 starts with knowing what makes it function as a complete system. At a basic...
What Is a Lower Receiver? Function, Parts, and Legal Overview
A lower receiver is the central structural component of an AR-15 platform. It houses the fire...
What Is an Upper Receiver? Complete Breakdown
The upper receiver is the top half of the rifle’s receiver assembly. On AR-pattern rifles, it holds...
AR Platform Explained: Complete Beginner Guide
The AR platform is a modular rifle system built around a two-part receiver architecture and a gas...
