Leatherhead, the major difference is the M64 is a stainless M10. That means .38 & +p only, no .357 rounds
The M65 is the stainless version of the M13 and the M66 is the stainless M19
The M65 is the stainless version of the M13 and the M66 is the stainless M19
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....mikey357

