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roll pins should be just below the surface

Gun Gear

AR-15 Maintenance: Roll Pins

AR-15s are pretty much pinned together. While a staple for many AR-15s, roll pins are not hard to work with, but a misstep could be catastrophic enough to permanently damage your AR-15. Here’s how to perform the essential construction operations associated with roll pins—the professional way.

Gas rings on an AR-15 rifle

Firearms

Six Troubleshooting Solutions for AR-15 Function

When something goes wrong and the rifle won’t fire, the first question should always be, “What changed?” Before answering that, we have to determine—or at least I determine—whether we’re talking about a “fresh” rifle going through its shakedown period, or a (previously) trusted gun that’s suddenly decided to stop running. If it’s the first scenario, there’s a longer list of possibilities that include original parts, conditions, and installation quality. This article will focus on the previously-functioning rifle that’s taken a vacation from operation.

Four cartridge heads showing the effect of pressure

Ammunition

Reloading 101: Determining Safe Maximum Velocity

Part of the process of developing the load we’re seeking is learning how to safely set a cap on its pressure. Most of us don’t have pressure-testing equipment, so we rely on measurements and observation to know when we’re at the limit. Here are a few ideas on how to proceed in load testing to find the safe maximum velocity, and keep it safe.

AR-15 with SOCOM Boom Tube stock

Firearms

AR-15 Carbine Configuration

Don’t short-change a short gun! When you spec a carbine, think about shooting it! Simple? Yes. But don’t adapt to the carbine; make it adapt to you. Here are a few thoughts on how to get the most utility from your carbine.

Older model Colt AR-15 magazine circa 1960

Gun Gear

Magazine Maintenance for the AR-15

I get a lot of correspondence from folks complaining about magazine problems. I never liked the answer I gave them, and that’s led to this article. There are four pieces-parts to a box magazine: the follower, which is the tray that lifts the cartridges into position; the spring, which powers the follower; the base plate, which secures the spring; and the box. This article looks at all of them and gives tips to maintain and repair your magazines.

Brass rifle cartridge cases

General

Reloading 101: The Cartridge Case

In this installment of Reloading 101, it’s good to keep in mind what you’re dealing with, and that is a cartridge case, and what happens to it during firing, which is what we’re setting out to remedy when we reuse it. Read the full article to find out what’s going on with your brass.

Competitive Shooting

AR-15 Barrel-Twist Rates

A barrel-twist rate is expressed in a chain of numbers that reflects on how far down the barrel a bullet must travel to make one full rotation. To fully understand barrel twist, read this article.

Firearms

AR-15 Barrel Basics, Part 2

In Part 2, High Master Glen Zediker writes about important considerations in choosing a barrel for your AR-15, including contours, length, life expectancy, crowns, cryo treatments, and chambering choices. Read this article article to learn more.

AR-15 Stainless Chromoly Rifle Barrels by Glen Zediker

Firearms

AR-15 Barrel Basics, Part I

The difference between a rifle that shoots well and one that shoots very well is in the barrel. The standard for “shoot well” is ultimately subjective, but some manufacturing factors contribute to accuracy, the author explains, and some don’t.