Muzzle Brake vs Compensator vs Flash Hider: What's the Difference?
What each AR-15 muzzle device actually does, how loud it is for you and the shooter next to you, and which one fits your …
Blog
Build guides, part comparisons and picks for your next AR-15.
How to Assemble an AR-15 Lower Receiver: Step-by-Step with Photos
Every step of building an AR-15 lower from a stripped receiver and a lower parts kit, photographed on a real build, plus the tools, …
What Does the Forward Assist Do on an AR-15? (And Do You Need One?)
What the button behind the ejection port actually does, when to press it (and when not to), and whether you should build with a …
AR-15 Buffer Weights Explained: Carbine vs H1 vs H2 vs H3
What carbine, H1, H2 and H3 buffers weigh, which one your rifle needs, and how to read your ejection pattern to tune it.
What Size Gas Block Do I Need for My AR-15?
The four common gas block sizes, which barrels use each, how to measure your barrel's journal, and low-profile, adjustable and pinned blocks.
300 Blackout BCG and Magazines: What Works?
Why your 5.56 bolt carrier group and lower work with 300 Blackout, when magazines matter, and the one safety rule every 300 Blackout owner …
6.5 Grendel Bolt: Why It Needs Its Own Bolt Carrier Group
Why a 6.5 Grendel AR-15 needs a Grendel bolt, what else changes from 5.56, and why 6mm ARC uses the same bolt.
Mil-Spec vs Commercial Buffer Tube: What's the Difference?
Why a stock fits one buffer tube and wobbles on another: the diameter, thread and end-cap differences, how to measure yours, and which one …