An AR15 upper is the upper receiver component of an AR-15 rifle, housing the barrel, bolt carrier group, charging handle, 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 AR15 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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