A 300 Blackout pistol upper is a complete upper receiver assembly designed for AR-15 pistols chambered in 300 AAC Blackout. It typically includes a short barrel (often 7″–10.5″), handguard, gas system, and sometimes a bolt carrier group and charging handle. This upper works with AR-15 pistol lower receivers, compatible buffer tubes, magazines, and standard AR-15 parts, making it ideal for compact, maneuverable builds focused on home defense, tactical use, or range shooting.
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