The second number ("7" and "8") mean that one rotation occurred in either seven or eight inches. The first number ("1") means your bullet rotated one full rotation. You've probably seen numbers and figures spelling out twist rates like "1:7"or "1-in-8 twist". Twist rate in a barrel is the same concept. How many times does the ball spin before it hits its mark? Think of it like throwing a good ole' pig-skin. More importantly, this dictates how accurate your rifle or pistol is. Twist rate determines how often the round you fire completes a full rotation in a given distance. Twist rate's arguably the most important factor in your AR-15's barrel. This article is a part of our Full Parts Guide to Building an AR-15. We'll even get into barrel profiles, rifling, and barrel treatments. We'll explain twist rate, barrel length and velocity, how barrels are made, and with what materials. Today, we're going to go over everything with a complete guide to AR-15 barrels! Picking the perfect barrel can make or break any AR build. It determines what types of rounds you can shoot, how accurate you can get, and how far you can reach out and touch targets. The barrel is arguably the most important part of your AR-15.
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