An AR-15 upper is the upper receiver component of an AR-15 rifle, housing the barrel, bolt carrier group, charging handle, and often the handguard and gas system. It works with AR-15 lower receivers, barrels, handguards, gas blocks, gas tubes, bolt carrier groups, charging handles, and optics or iron sights. The AR-15 upper is essential for building or customizing rifles, offering compatibility with a wide range of standard AR-15 parts for hunting, target shooting, and tactical applications.
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