Dirt_Dad
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I think that would work for my Mark II with bull barrel and probably the Marlin 880. But is there such a thing as internal threading? The P90 and and Kahr CW9 don't have an extended barrel, so unless it could be done internally, I don't see any options there. There's a chance I might be able to find one for my wife's Sig.A competent gunsmith can usually thread the existing barrel for a reasonable price.....