assembled AR-15 bolt carrier group resting on a wooden surface

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

A bolt carrier group buying guide should do more than list coatings, brands, or price points. The bolt carrier group is one of the most important functional assemblies in an AR-15 because it directly controls chambering, locking, firing support, extraction, ejection, and cycling. If the…

ByUpper AuthorityMay 5, 20260Comments

Disassembled bolt carrier group components arranged on a wooden surface, including the carrier, bolt, firing pin, cam pin, and small parts

Firearms

Bolt Carrier Group Maintenance: Cleaning, Lubrication, and Wear Points

Bolt carrier group maintenance is one of the most practical skills you can develop as an AR-15 owner. It sits at the center of reliability, directly affecting how consistently your rifle cycles, how long components last, and how well the system performs under real-world use. The…

ByUpper AuthorityMay 3, 20260Comments

Side-by-side comparison diagram of two rifle operating systems showing gas flow in a direct impingement system and a piston-operated system

Firearms

Direct Impingement vs Piston AR: Key Differences and Tradeoffs

Choosing between a direct impingement (DI) system and a piston-driven AR isn’t just a technical preference—it directly affects reliability, maintenance, recoil behavior, and long-term build decisions. While both systems operate within the same platform, the way they manage gas and cycle the action creates meaningful…

ByUpper AuthorityApril 27, 20260Comments

Bolt carrier group partially extended from an AR-15 upper receiver showing bolt lugs and cam pin on a workbench

Firearms

AR-15 Cycle of Operations: How the Rifle Functions Step by Step

Understanding the AR-15 cycle of operations is the difference between simply owning a rifle and actually understanding how it functions under real conditions. This cycle is not just a sequence of mechanical events—it is a tightly timed system where gas pressure, component geometry, spring tension,…

ByUpper AuthorityApril 26, 20260Comments

Disassembled AR-15 components arranged on a workbench, including upper receiver, lower receiver, bolt carrier group, and buffer system

Firearms

AR Platform Fundamentals: How the System Works

The AR platform is often described as modular, reliable, and adaptable—but those descriptions only make sense once you understand how the system actually functions. This is not a single-purpose rifle design. It is a system of interdependent components where each part influences how the others…

ByUpper AuthorityApril 26, 20260Comments

AR-15 bolt carrier group with bolt extended next to a barrel extension on a workbench

Firearms

AR-15 Headspace Explained: What It Is and Why It Matters

Headspace is one of those terms that gets mentioned often in technical discussions but rarely explained in a way that connects directly to how an AR-15 actually functions. It’s not a visible part, and it’s not something you adjust casually, but it plays a critical…

ByUpper AuthorityApril 26, 20260Comments

Close-up of an AR-15 upper receiver on a workbench with the gas block, gas tube, and partially removed bolt carrier group visible.

Firearms

AR-15 Dwell Time Explained: How It Affects Cycling and Reliability

Dwell time is one of the least understood—but most influential—variables in how an AR-15 functions. It doesn’t refer to a visible part or a component you can easily swap. Instead, it describes a timing window inside the firing cycle that determines how long gas pressure…

ByUpper AuthorityApril 25, 20260Comments

AR-15 bolt carrier group on a dark workbench showing bolt lugs and carrier body

Firearms

Bolt Locking and Unlocking Process Explained

The bolt locking and unlocking process is one of the most critical mechanical functions inside the AR-15 platform. It determines when the rifle can safely fire, when it begins to cycle, and how reliably it operates under different conditions. While many shooters understand the basics…

ByUpper AuthorityApril 25, 20260Comments

Several AR-15 buffer tubes and related components arranged on a dark workbench surface

Firearms

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

Choosing the right buffer tube for an AR-15 build is one of those decisions that looks simple on the surface but quietly affects fitment, reliability, and long-term durability. It’s not a flashy component, and it’s rarely marketed as a performance upgrade—but it sits at the…

ByUpper AuthorityApril 25, 20260Comments

Close-up of an AR-15 lower receiver with buffer tube, buffer spring, and buffer partially removed

Firearms

AR-15 Buffer System Basics: How It Works and Why It Matters

The AR-15 buffer system is one of the least visible but most important components in the rifle’s operation. It sits behind the action, out of sight inside the receiver extension, yet it plays a central role in controlling recoil, managing cycling speed, and ensuring reliability…

ByUpper AuthorityApril 20, 20260Comments