I recently wondered about the eligibility of Russian commercial Makarovs for C&R sales. The FAQ here says:
Which Makarovs are considered Curios and Relics?
The list of C&R weapons includes both the East German and Russian Makarovs, the general consensus is that only the original Russian military Makarovs are included among the Russian guns. That is, the commercially produced Baikal IJ-70 with a rear target sight does not qualify under the spirit of the C&R law.
The Bulgarian (including Miltex), Chinese, and Simson-Suhl are not considered curio & relics.
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It rather hazily mentions 'general consensus' which to me is not a definitive answer.
There appears to be no reason why they wouldn't be eligible. The list does not specify anything like 'ex-military only', it simply says:
Makarov, pistol, Russian and East German, caliber 9mm Makarov.
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In other words, there is no good reason why a 9x18 IJ70, even a double-stack one, couldn't be transferred directly to a C&R holder. It cannot be a matter of markings because most Makarov pistols do not bear a model marking of that name, including the ex-military Russians and East Germans. Also, needless to say, age has nothing to do with the eligibility of a gun named on the list.
PS: After a search, I became aware that I'm far from the first to raise this issue, but I haven't yet seen a satisfying answer to the question.