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  1. HK REFERENCE LIBRARY
    Hello, can anyone help me identifying the thread type used in HK416/MR556/MR223 barrel nuts? In another forum thread I read that the HK416 uses metric threads with a 1.5 mm pitch, but the diameter was not specified. Since the AR-15 uses 1.250"-18 TPI (which equals M31.75 x 16.93 mm in metric...
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