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  4. Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 10.5"
    Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 10.5"
    As low as $550.00
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  5. Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 12.5"
    Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 12.5"
    As low as $600.00
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  11. 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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  12. 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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  1. Product Type AR-15 Partial Upper Receiver Remove This Item
  2. Manufacturer Rainier Arms, LLC Remove This Item
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Barrel Length
  1. 8" 1 item
  2. 8.5" 1 item
  3. 10.5" 4 items
  4. 10.7" 1 item
  5. 11.5" 2 items
  6. 12" 1 item
  7. 12.5" 3 items
  8. 14.5" 2 items
  9. 16" 2 items
  10. 18" 1 item
Barrel Profile
  1. SPR 1 item
  2. Non-fluted 1 item
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 2 items
  3. 300 Blackout 1 item
  4. 5.56 NATO 7 items
Color
Gas Block Diameter
  1. .750" 11 items
Gas Length
  1. Carbine 3 items
  2. Mid 3 items
Height
  1. Absolute Co-Witness 1 item
Is Firearms?
  1. No 12 items
Mount
  1. M-LOK 3 items
Platform
  1. AR-15 6 items
Price
  1. $0.00 - $999.99 11 items
  2. $1,000.00 and above 1 item
Rail Length
  1. 7" 2 items
  2. 9.5" 2 items
  3. 9.55" 4 items
  4. 10.7" 2 items
  5. 11.7" 2 items
  6. 11.75" 1 item
  7. 12.5" 1 item
  8. 13.7" 2 items
  9. 15" 2 items
Thread Pitch
  1. 1/2x28 8 items
  2. 5/8x24 2 items
Threaded
  1. Yes 6 items
  2. No 1 item
Twist Rate
  1. 1:7 5 items
  2. 1:8 1 item
Stock Status
  1. In stock 10 items
  2. Out of stock 2 items
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