Big Slider - Upper Authority

Fundamentals

AR-15 Gas Port Size Explained: Reliability, Recoil, and Cycling

2 weeks ago

by Upper Authority Editorial Team

Maintenance

Overgassed vs Undergassed AR-15: Symptoms, Causes, and Fixes

2 weeks ago

by Upper Authority Editorial Team

Infographic showing overgassed, ideal, and undergassed AR-15 ejection patterns with recoil and cycling characteristics.

Fundamentals

AR-15 Gas System Explained: How It Actually Works

3 weeks ago

by Upper Authority Editorial Team

Close-up of an AR-15 barrel with gas block and gas tube on a light background

Latest

Complete AR-15 upper receiver assembly with handguard and barrel on a neutral background

Equipment • Upper Receivers

Best AR Upper Receivers by Use Case

1 month ago

Close-up of an AR-15 upper and lower receiver separated at the takedown pins

Upper vs Lower Receiver: Key Differences Explained

1 month ago

Mil-Spec vs Commercial AR Parts: What Actually Matters

2 months ago

Close-up of an AR-15 bolt showing locking lugs and front face against a black background

Bolt Carrier Groups • Equipment

Bolt Carrier Group Parts: Complete Breakdown and Function

2 months ago

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

2 months ago