S.S.:  The IJ70 is one of the best variants of the Makarov.  The only thing I might get, if I owned one, would be a 380 barrel for a changeover when the dumbocraps tell us they won't allow the import of any more foreign (Russian/Soviet/Commie/Chinese) ammo into the US.  
There aren't any issues with the Maks that I have heard of.  The only spare parts I would accumulate would be a bunch of extra magazines.   JMTCW.  Mikey.