5.56 (commonly referring to 5.56 NATO or 5.56x45mm) is a widely used rifle cartridge, especially in AR-15 platforms for military, law enforcement, and civilian shooting. While not a manufacturer, many companies produce 5.56-specific parts, including barrels, upper and lower receivers, bolt carrier groups, magazines, and complete rifles or pistols. These components are compatible with AR-15 rifles and other 5.56 platforms, making 5.56 a top choice for shooters seeking reliable, high-performance solutions for target shooting, hunting, and tactical applications.
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