The interrupted/half threads are the same system the Ithaca Model 37 uses to attach barrels. I think this would work the same way for mounting a suppressor, and the body of the unit would bottom on the flange remaining behind the threads--1/4 twist, and it would be snug.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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