I have a Mark III and other than the easier disassembly, I know of no reason to buy a Mark IV. It only takes me a couple of minutes to take it apart anyway so I have no reason at all to "upgrade". I bought my Mark III with plans on it being the last rimfire handgun I would ever need. I thought the same thing when I bought my Marlin Model 60 rifle and again when I bought my Henry lever action and yet again when I bought a Mossberg Blaze 47.
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