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My buddy has one of those underfolders on his CZ and I find the LOP too great. I'm 6 foot and the factory side folder was perfect for how short the VZ-58 is IMHO.
I would pay a great deal of money for this style of conversion, if it were feasible. It looks like there may be enough space below the striker spring to fit the cross bolt of the underfolder if it were positioned cleverly. If any manufacturer is interested in toying with the idea as a project please PM me.