A 1:9 barrel twist rate means the rifling completes one full turn every 9 inches inside the barrel. Commonly used in AR-15 barrels chambered in .223 Remington or 5.56 NATO, this twist rate stabilizes a wide range of bullet weights, typically from 45 to 69 grains. It works with AR-15 barrels, upper receivers, and complete rifle or pistol builds, offering versatile performance for target shooting, hunting, and general use.
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