1. ProMag Magazine HK USC 45 ACP Polymer Black
    ProMag Magazine HK USC 45 ACP Polymer Black 2.9 (8 Reviews)
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  2. HK Magazine HK USC 45 ACP 10-Round Polymer Black
    HK Magazine HK USC 45 ACP 10-Round Polymer Black 5.0 (2 Reviews)
    $62.99
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  3. HK Magazine Clamp USC Black
    HK Magazine Clamp USC Black 2.5 (2 Reviews)
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  4. HK Handguard Rail USC, SL8
    HK Handguard Rail USC, SL8
    $59.99
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