.308 Ballistics Chart: Velocity, Drop and Energy for the AR-10
Published .308 velocity, energy and drop for 150 and 168 grain loads, and what a 16 to 20 inch AR-10 barrel gives up compared …
Blog
Build guides, part comparisons and picks for your next AR-15.
How an AR-15 Trigger Works: Disconnector, Reset and Diagram
What each part of the AR-15 fire control group does, how one pull fires one shot and resets, and how to check yours works.
5.56 NATO Ballistics Chart: 55 vs 62 vs 77 Grain, 16-Inch vs 20-Inch Barrels
Published velocity, energy and drop for 55, 62 and 75 grain 5.56 loads, Black Hills 77 grain figures, and what a 16-inch barrel loses …
300 Blackout Ballistics Chart: Supersonic vs Subsonic Velocity, Energy and Drop
Published velocity, energy and drop for four popular 300 Blackout loads, supersonic and subsonic, from the makers' own tables.
AR-15 Bolt Carrier Groups: Full-Auto vs Semi, Nitride vs Phosphate vs Chrome
Full-auto (M16) vs semi-auto carriers, nitride vs phosphate vs chrome vs nickel boron, and what actually decides whether a bolt carrier group is any …
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 …
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 …