A 5.56 upper is a complete upper receiver assembly for AR-15 rifles chambered in 5.56 NATO or .223 Remington. It typically includes the upper receiver, 5.56 barrel, handguard, gas system, and often a bolt carrier group and charging handle. The 5.56 upper works with AR-15 lower receivers, magazines, buffer systems, and other standard AR-15 parts, making it ideal for easy caliber conversion, custom builds, or upgrades for target shooting, hunting, and tactical use.
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