(Photo courtesy/Guns America)Īs projectiles come in different weights denoted in “grains” – 55-grain, 62-grain, 77-grain, etc. Think of how throwing a football with a perfect spiral makes it travel far and fast. This is called rifling, responsible for spinning the projectile in order to stabilize it as it travels. Sometimes ignored or overlooked by inexperienced shooters, this number plays a critical role when determining what ammo to use to achieve optimum performance.įor those new to firearms (or who simply need a refresher), inside the barrel of most centerfire and rimfire rifles and pistols (and all AR-15s), you’ll find a series of lands and grooves cut into the barrel. In this case, the bullet makes one full rotation every seven inches.Īn illustration of different barrel twist rates. Twist rate is the ratio of inches of bullet travel down the barrel needed to rotate the projectile one full turn. To a novice, the wealth of data can be overwhelming, and leads to a lot of questions, namely “what does all of this mean?” and “which one of these should I buy?”Īmong the plethora of numbers found in AR-15 spec sheets is a figure called “twist rate,” denoted typically by a pair of numbers in a ratio, such as 1:7. It’s easy to get caught up in the specs when researching, learning and choosing an AR-15 rifle.
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