A 16″ upper is a complete AR-15 upper receiver assembly featuring a 16-inch barrel, which is the standard legal length for rifles. It typically includes the barrel, upper receiver, handguard, gas system (carbine or mid-length), and may include a bolt carrier group and charging handle. The 16″ upper works with AR-15 lower receivers, compatible magazines, buffer systems, and standard AR-15 parts, making it ideal for versatile builds used in target shooting, hunting, and home defense.
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