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16MM x 1LH(female) to .578″-28 TPI (male) Thread Converter, Heckler and Koch, HK – SKU#058 – Hughes Precision LLC
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14 mm x 1 LH (female) to 5/8″-24 (male) Barrel Adapter Thread Converter – SKU#071 – Hughes Precision LLC
US Machinegun: AR-15 NON THREADED BARREL - THREAD ADAPTER to 1/2x28, *THREAD ADAPTERS & THREAD EXTENSIONS, TA-NON15
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