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Home ยป Fundamentals

Fundamentals

Close-up of an AR-15 buffer tube showing the rear profile and cylindrical body on a white background
Fundamentals

Mil-Spec vs Commercial AR Parts: What Actually Matters

4 days ago
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Close-up of an AR-15 bolt carrier group showing the carrier body, gas key, and bolt face against a black background
Fundamentals

How the Bolt Carrier Group Works: A Clear Breakdown

2 weeks ago
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Close-up of an AR-15 receiver area showing the upper and lower receiver, trigger, magazine well, and optic mounted on the rail
Fundamentals

How an AR-15 Works: Complete Cycling Process Explained

2 weeks ago
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Blueprint-style diagram of an AR-15 rifle showing internal and external components
Fundamentals

AR-15 Parts List: Complete Breakdown of Every Component

2 weeks ago
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Close-up view of an AR-15 lower receiver showing the trigger, safety selector, and magazine well
Fundamentals

What Is a Lower Receiver? Function, Parts, and Legal Overview

3 weeks ago
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Close-up of an AR-15 upper receiver showing the ejection port and top rail
Fundamentals

What Is an Upper Receiver? Complete Breakdown

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

AR Platform Explained: Complete Beginner Guide

1 month ago
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Featured Posts

  • Close-up of an AR-15 buffer tube showing the rear profile and cylindrical body on a white background
    Mil-Spec vs Commercial AR Parts: What Actually...
  • Close-up of an AR-15 bolt showing locking lugs and front face against a black background
    Bolt Carrier Group Parts: Complete Breakdown and...
  • Close-up of an AR-15 bolt carrier group showing the carrier body, gas key, and bolt face against a black background
    How the Bolt Carrier Group Works: A Clear Breakdown
  • Close-up of an AR-15 receiver area showing the upper and lower receiver, trigger, magazine well, and optic mounted on the rail
    How an AR-15 Works: Complete Cycling Process...
  • Blueprint-style diagram of an AR-15 rifle showing internal and external components
    AR-15 Parts List: Complete Breakdown of Every...

Upper Authority

Upper Authority is a structured educational resource focused on AR platform configuration, component evaluation, and performance consistency.

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