Blueprint-style diagram of an AR-15 rifle showing internal and external components

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 level, the platform is built around two primary assemblies—the upper and lower receiver—but the actual ar 15 parts list extends well beyond those two components. Each part contributes…

ByUpper AuthorityMarch 21, 20260Comments

Black stripped AR-15 lower receiver resting in grass with rolling hills in the background.

Firearms

What Is an AR-15 Lower Receiver?

The AR-15 lower receiver is the bottom half of the rifle's two-part receiver system. It houses the trigger mechanism, supports the magazine and operating controls, and provides attachment points for the pistol grip, buffer system, and stock. Unlike the upper receiver, which supports the barrel…

ByUpper AuthorityMarch 18, 20261Comment

AR-15 upper receiver assembly with black M-LOK handguard and muzzle device against a desert canyon backdrop.

Firearms

What Is an AR-15 Upper Receiver? Complete Breakdown

The AR-15 upper receiver is the upper portion of the rifle's two-part receiver system. It supports the barrel, houses the bolt carrier group and charging handle, and provides the structure for several components involved in the firing and cycling process. Although the upper receiver itself…

ByUpper AuthorityMarch 17, 20261Comment

Exploded blueprint view of an AR-15 platform rifle showing separated modular components including upper receiver, lower receiver, handguards, stock, and magazines

Firearms

AR Platform Explained: Complete Beginner Guide

Most AR buying mistakes start with the same problem: trying to choose parts before understanding the platform itself. The AR platform is often described as a rifle, but that is only part of the picture. It is better understood as a modular system built around two…

ByUpper AuthorityMarch 1, 20260Comments