This 13.5x1 LH 3 lug adapter is an 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.
The 13.5mm version has flats for a wrench on that cylinder extension and has the O-ring interface typical of 13.5x1 LH mounts.
Made from 17-4ph stainless and Melonite QPQ treated.
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