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  3. 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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  4. 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. Bravo Company MFG (BCM) MK2 5.56 NATO Upper Receiver Group w/ MCMR-15 Handguard - 16" FDE
    Bravo Company MFG (BCM) MK2 5.56 NATO Upper Receiver Group w/ MCMR-15 Handguard - 16" FDE
    $747.39
    Out of stock
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  14. Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" Black
    Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" Black
    $1,412.00
    Out of stock
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  15. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  16. Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    $807.50
    Out of stock
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  1. Caliber 5.56 NATO Remove This Item
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  1. AR-15 Complete Upper Receiver 12 items
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