Yes the AR 6200 has been discontinued and replaced by the AR 6210. Visually and functionally they are, as far as i can tell, the same. Presumably there have been some internal tweaks to the design, I have both and for me they both work fine.
If you buy from any reputable dealer then you should get an original product. I've picked them up from eBay and had no trouble. If you buy one from a 'in-country' supplier rather than from China, and it comes in full retail packaging, from a dealer with solid feedback, then you should be safe enough.