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  1. Rainier Arms RUC PRO Mk1 Riflespeed Partial Upper Receiver - 11.5"
    Rainier Arms RUC PRO Mk1 Riflespeed Partial Upper Receiver - 11.5"
    $750.00
    Out of stock
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  2. Rainier Arms RUC PRO Mk1 5.56 NATO Riflespeed Partial Upper Receiver - 12"
    Rainier Arms RUC PRO Mk1 5.56 NATO Riflespeed Partial Upper Receiver - 12"
    $750.00
    Out of stock
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  3. Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    $1,050.00
    Out of stock
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  1. Gas Block Diameter .750" Remove This Item
  2. Product Type AR-15 Partial Upper Receiver Remove This Item
  3. Is Firearms? No Remove This Item
  4. Manufacturer Rainier Arms, LLC Remove This Item
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