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Mfg Item #: Griffin 3L1228
These 3 Lug adapters are HK pattern and will work with any 3 lug silencer on the market made to this standard. They will also work with Griffin 3 lug interface assemblies - 1/2x28 Thread Total Length: 1.4375. Based off of industry standard .625 barrel threads added length should be .8125. - Made from 17-4ph stainless and Melonite QPQ treated.