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  11. 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"
    $550.00
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  12. 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"
    $600.00
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  13. Maxim Defense MDX 510 5.56 NATO Mil-Spec Complete Upper - 10.3"
    Maxim Defense MDX 510 5.56 NATO Mil-Spec Complete Upper - 10.3"
    $1,255.50
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  16. Aero Precision M4E1 300BLK Complete Upper Receiver w/Atlas R-ONE Handguard - 8" Black
    Aero Precision M4E1 300BLK Complete Upper Receiver w/Atlas R-ONE Handguard - 8" Black
    $534.99
    Out of stock
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Barrel Length
  1. 8" 1 item
  2. 8.3" 2 items
  3. 10.3" 1 item
  4. 10.5" 7 items
  5. 10.7" 1 item
  6. 11.5" 3 items
  7. 11.85" 1 item
  8. 12" 1 item
  9. 12.5" 3 items
  10. 13.7" 2 items
  11. 13.9" 3 items
  12. 14.5" 2 items
  13. 16" 9 items
  14. 18" 1 item
Barrel Profile
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  2. 300 Blackout 3 items
  3. 5.56 NATO 18 items
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  1. .750" 15 items
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  10. Primary Weapon Systems 1 item
  11. Rainier Arms, LLC 6 items
  12. Sharps Bros 1 item
  13. Sig Sauer 1 item
  14. Sons of Liberty Gun Works 9 items
Mount
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Price
  1. $0.00 - $999.99 25 items
  2. $1,000.00 and above 5 items
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  1. AR-15 Complete Upper Receiver 9 items
  2. AR-15 Partial Upper Receiver 14 items
  3. AR-15 Handguard 1 item
  4. AR-9 Upper Receiver 1 item
  5. Complete Upper 5 items
Rail Length
  1. 9.2" 1 item
  2. 9.5" 3 items
  3. 9.55" 3 items
  4. 10.7" 2 items
  5. 11" 2 items
  6. 11.7" 2 items
  7. 13" 1 item
  8. 13.7" 1 item
  9. 15" 8 items
Thread Pitch
  1. 1/2x28 25 items
  2. 1/2x36 1 item
  3. 5/8x24 3 items
Twist Rate
  1. 1:7 16 items
  2. 1:8 3 items
  3. 1:10 2 items
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  2. Out of stock 15 items
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