An AR-15 pistol upper build assembly is a complete upper receiver unit designed for AR-15 pistols, typically featuring a short barrel (7″–10.5″), hand guard, pistol length gas system, and often a bolt carrier group and charging handle. It works with AR-15 pistol lower receivers, compatible buffer tubes, magazines, and other standard AR-15 parts. This assembly’s ideal for building or upgrading compact, maneuverable AR-15 pistols for home defense, tactical use, or range shooting.
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