9mm M4 Complete Upper Half. Includes: Mil-Spec A3 Receiver, 4140 W.A.S.P. Barrel with 1/10 twist, ramped 9mm Bolt, charging handle. Fully Assembled. Uses a standard AR-15 or M16 hammer. Do not use with the dedicated 9mm hammer.
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Fast shipping, packaged well, and exactly as described. What more could you ask for?