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  7. 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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  8. 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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  13. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"
    Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"
    $1,199.99
    Out of stock
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  14. 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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  15. 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. Gas Block Diameter .750" Remove This Item
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Barrel Length
  1. 8" 2 items
  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" 4 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 1 item
  3. 300 Blackout 2 items
  4. 5.56 NATO 10 items
Category
  1. Complete Upper Receivers 4 items
  2. Partial Upper Receivers 11 items
Color
Finish
  1. Anodize 3 items
Gas Length
  1. Pistol 1 item
  2. Carbine 3 items
  3. Mid 5 items
Height
  1. Absolute Co-Witness 1 item
Is Firearms?
  1. No 15 items
Mount
  1. M-LOK 3 items
Platform
  1. AR-15 5 items
Price
  1. $0.00 - $999.99 11 items
  2. $1,000.00 and above 4 items
Product Type
  1. AR-15 Complete Upper Receiver 4 items
  2. AR-15 Partial Upper Receiver 11 items
Rail Length
  1. 7" 3 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" 4 items
Thread Pitch
  1. 1/2x28 11 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 12 items
  2. Out of stock 3 items
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