A 1:7 barrel twist rate means the rifling completes one full turn every 7 inches inside the barrel. Commonly used in AR-15 barrels chambered in .223 Remington or 5.56 NATO, this twist rate is ideal for stabilizing heavier bullets, typically 62 grains and above, such as military M855 rounds. It works with AR-15 barrels, upper receivers, and complete rifle or pistol builds, making it popular for tactical, defensive, and long-range shooting applications.
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