Builds & Assembly Guides
Step-by-step upper builds, torque specs, headspacing, and tools.
Free-Float vs Drop-In Handguards: Which One Do You Need?
Free-float handguards improve accuracy and mounting options; drop-in handguards install fast and cost less. Here's how to choose.
More Builds & Assembly Guides
AR-15 vs AR-10 Parts Compatibility: What Shares and What Doesn't
AR-15 and AR-10 look similar but share almost no parts. Here's exactly what interchanges and what requires the larger platform.
AR-15 Cycling Issues: The Full Troubleshooting Guide
Short strokes, failures to feed, stovepipes, and bolt-over-base: here's how to diagnose and fix the most common AR-15 cycling problems.
How to Clean an AR-15 Upper Receiver: The Full Guide
AR-15 uppers need less cleaning than most people think, but they do need cleaning. Here's the sensible full-cleaning routine that works.
AR-15 Barrel Break-In: Does It Actually Matter?
Barrel break-in procedures range from elaborate rituals to 'ignore it entirely.' Here's what actually helps, what doesn't, and how to do it right.
AR-15 Headspacing: What It Is, When to Check, How to Do It
Headspace determines whether an AR-15 chamber and bolt fit safely with a given cartridge. Here's what it means, when to check, and how.
Adjustable Gas Blocks: When You Need One and How to Tune
Adjustable gas blocks let you dial in exactly how much gas your AR-15 uses. Here's when they matter and how to tune yours correctly.
Muzzle Brake vs Compensator vs Flash Hider: The AR-15 Guide
Muzzle brakes, compensators, flash hiders, and hybrids all serve different roles on an AR-15. Here's what each does and which one you need.
Cold Hammer Forged vs Button Rifled Barrels: Which Is Better?
Cold hammer forged and button rifled AR-15 barrels are made differently and last differently. Here's how they compare on accuracy, longevity, and cost.
BCG Coatings Compared: Phosphate, Nitride, NiB, DLC, and More
Phosphate, nitride, nickel boron, DLC, TiN, and NP3 all coat AR-15 bolt carriers. Here's how they compare on wear, cleaning, and cost.
Full-Auto vs Semi-Auto BCG: What the Difference Actually Means
Full-auto and semi-auto bolt carrier groups look almost identical but have real differences in profile, mass, and reliability. Here's what matters.
Will This Upper Fit My Lower? The AR-15 Compatibility Checklist
How to verify an AR-15 upper will fit your lower before you buy. Mil-spec vs. proprietary, caliber compatibility, pin size, and common gotchas.
AR-15 Upper Torque Specs Cheat Sheet
Every AR-15 upper receiver torque spec you need in one place: barrel nut, gas block, castle nut, muzzle device, and handguard fasteners.
AR-15 Charging Handle Guide: Standard, Extended, and Ambidextrous Options
How AR-15 charging handles differ, standard mil-spec vs. extended tactical vs. ambidextrous, why shooters upgrade, and how to install one in five minutes.
How to Install an AR-15 Upper: Step-by-Step Guide
A complete walkthrough for installing an AR-15 upper onto a lower receiver, plus torque specs, headspacing basics, and common mistakes to avoid.