I donít know how anyone can collect these guns without owning Rob Stotts AK books. The electronic version of the books comes up to around $100 for all of them and you will never have to ask these questions again. Well, you will have many many less questions.
He did one full book on just Romanian Ak74ís
Which are MD86 if domestic and AIMS74 if export. AIMR74 is export shorty.
There are both non railed and railed domestic MD86ís, the best place to get one is off someone that stripped a imported romy gun. The real rails are pretty easy to tell apart from a replica.
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