A bolt carrier group (BCG) is often treated as a drop-in component. In reality, it’s one of the...
Author - Upper Authority Editorial Team
AR-15 Parts Compatibility Guide: What Works and What Doesn’t
Building or modifying an AR-15 is often described as simple because of the platform’s modular...
AR-15 Parts Overview: Components and How They Work
An AR-15 is not a single-purpose tool—it’s a modular system built from interdependent components...
What Is a Bolt Carrier Group? Role and Function in an AR-15
If you strip an AR-15 down to the components that actually make it function, one part consistently...
AR Maintenance Basics: Keeping Your Rifle Reliable Over Time
Maintenance is not optional on the AR platform. It is part of how the system is designed to...
Best Budget BCG Options for Reliable AR Builds
Choosing the right bolt carrier group (BCG) is one of the most important decisions in an AR build...
PSA vs BCM Comparison: Which AR-15 Brand Fits Your Build
For many buyers, a PSA vs BCM comparison is not really about brand loyalty. It is about deciding...
Budget AR Build Guide: Smart Parts and Cost Breakdown
Building a reliable AR-15 on a budget is not about finding the cheapest parts. It is about...
Best AR Upper Receivers by Use Case
Choosing the best AR upper receiver is not just about picking a brand or price point. It is about...
Upper vs Lower Receiver: Key Differences Explained
If you are new to the AR platform, the terms upper receiver and lower receiver can sound more...
