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  4. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    $1,299.99
    Out of stock
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  5. Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 14.5" FDE
    Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 14.5" FDE
    $600.00
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  1. Gas Block Diameter .750" Remove This Item
  2. Thread Pitch 1/2x28 Remove This Item
  3. Is Firearms? No Remove This Item
  4. Caliber 5.56 NATO Remove This Item
  5. Gas System Length Mid Remove This Item
  6. Manufacturer Rainier Arms, LLC Remove This Item
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