Upper Authority
  • Equipment
  • Builds
  • Fundamentals
  • Maintenance
  • Legal
  • About
Upper Authority
  • Equipment
  • Builds
  • Fundamentals
  • Maintenance
  • Legal
  • About

Home ยป Equipment

Equipment

assembled AR-15 bolt carrier group resting on a wooden surface
Bolt Carrier Groups • Equipment

Best Bolt Carrier Groups by Use Case and Reliability

2 weeks ago
Add Comment
assembled AR-15 bolt carrier group resting on a wooden surface
Bolt Carrier Groups • Equipment

Bolt Carrier Group Buying Guide: How to Choose the Right BCG

2 weeks ago
Add Comment
Several AR-15 buffer tubes and related components arranged on a dark workbench surface
Accessories • Equipment

Best AR-15 Buffer Tubes: What Actually Matters and What to Buy

4 weeks ago
Add Comment
Side-by-side comparison of two buffer tubes measured with calipers showing diameter differences and rear profile shapes
Accessories • Equipment

Mil-Spec vs Commercial Buffer Tube Dimensions Explained

1 month ago
Add Comment
Two black AR-style buffer tubes labeled mil-spec and commercial placed side by side on a dark surface
Accessories • Equipment

AR Buffer Tube Compatibility Chart

1 month ago
Add Comment
Two black AR-15 buttstocks placed facing each other on a dark textured surface with soft studio lighting
Accessories • Equipment

AR-15 Stock Compatibility Guide: What Fits and Why It Matters

1 month ago
Add Comment
Three AR-style buffer tubes in black, gray, and tan finishes arranged diagonally on a dark workbench surface
Accessories • Equipment

Buffer Tube Types and Differences Explained

1 month ago
Add Comment
A bolt carrier group component shown at an angle on a white background
Bolt Carrier Groups • Equipment

What Is a Bolt Carrier Group? Role and Function in an AR-15

1 month ago
Add Comment
Close-up of an AR-15 bolt carrier group showing the gas key and bolt assembly on a white background
Bolt Carrier Groups • Equipment

Best Budget BCG Options for Reliable AR Builds

1 month ago
Add Comment
Two AR-15 upper receivers shown side by side, PSA on top and BCM on bottom, both with 16-inch barrels and M-LOK handguards
Equipment

PSA vs BCM Comparison: Which AR-15 Brand Fits Your Build

1 month ago
Add Comment
Load more

Equipment Components

  • Accessories
  • Bolt Carrier Groups
  • Upper Receivers

Featured Posts

  • Fundamentals AR-15 Gas Port Size Explained: Reliability, Recoil...
  • Infographic showing overgassed, ideal, and undergassed AR-15 ejection patterns with recoil and cycling characteristics.
    Maintenance Overgassed vs Undergassed AR-15: Symptoms, Causes...
  • Close-up of an AR-15 barrel with gas block and gas tube on a light background
    Fundamentals AR-15 Gas System Explained: How It Actually Works

Upper Authority

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

Start Here:

AR Platform Explained

Equipment Guides

  • Best Upper Receivers
  • Best Bolt Carrier Groups
  • Best AR Optics
  • Budget Upper Receiver Guide
  • AR-10 vs AR-15 Comparison

Explore

Equipment

Builds

Fundamentals

Maintenance

Legal

Copyright © 2026 Upper Authority. All rights reserved.