Fullauto AR-18 vs. Brownells BRN180

Published on January 9, 2020
Duration: 26:10

This guide details the field stripping process for the original Armalite AR-18 and the Brownells BRN-180 upper receiver, highlighting their internal differences and similarities. The video emphasizes the historical evolution from the stamped AR-18 to the modern, machined BRN-180 upper, showcasing the short-stroke piston system and dual guide rod assembly. Expert analysis from a firearms historian provides context on design choices and manufacturing techniques.

Quick Summary

The Brownells BRN-180 upper receiver offers a modern take on the AR-180 design, fitting standard AR-15 lowers and retaining the short-stroke piston system. Unlike the original AR-18's stamped steel construction, the BRN-180 upper is machined from aluminum, providing enhanced durability and modern features like M-LOK rails.

Chapters

  1. 00:10Introduction to the Armalite AR-18
  2. 00:55Design History and Licensing
  3. 02:27Manufacturing and Historical Context
  4. 04:38Shooting the Full-Auto AR-18
  5. 05:16The AR-180B and Its Flaws
  6. 08:47Brownells BRN-180 Introduction
  7. 11:02Internal Comparison and Field Stripping
  8. 14:08BRN-180 Features and Performance

Frequently Asked Questions

What is the main difference between the Armalite AR-18 and the Brownells BRN-180?

The original Armalite AR-18 is a complete firearm often made with stamped steel, while the Brownells BRN-180 is an upper receiver designed to fit standard AR-15 lower receivers, typically machined from aluminum and featuring modern enhancements like M-LOK rails.

Why was the AR-18 designed with a short-stroke gas piston system?

Armalite developed the short-stroke gas piston system for the AR-18 to avoid patent infringement on Eugene Stoner's direct impingement system used in the AR-15 and M16, aiming for a cheaper and easier-to-manufacture design.

What are the key internal similarities between the AR-18 and BRN-180?

Both the original AR-18 and the BRN-180 upper receiver utilize a short-stroke gas piston operating system and feature a dual guide rod and spring recoil assembly, contributing to their distinct operating characteristics.

What historical significance does the AR-18 hold?

The AR-18, influenced by Eugene Stoner, was Armalite's attempt at a more cost-effective rifle using stamped metal. Though not widely adopted by major militaries, it was manufactured internationally and notably used by the IRA.

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