This happened in Korea, and I'm trying to get my money back. This guy sold me what he said was an SM-6 mic. I plugged it into my Icom 7300, and I get huge RF feedback (I have no problems with any other mics and this radio). So I checked, and the bottom of the mic clearly shows it's an old SM-2. There is a connector on it that fits my 7300, but it's not working right. I am trying to get my money back, but the guy keeps trying to tell me that the SM-2 is the same as the SM-6, only the SM-6 has the 8-pin connector. Apparently he thinks just having the 8-pin connector magically makes it an SM-6 despite what's on the bottom. He says he will send my money back, but in case he tries to come up with more sob crap about an SM-2 being the same thing, what is different, internally, that would make the SM-2 feed back horribly on my 7300? It sounds like lots of RF feedback. When I key the mic, I hear the room noise, but as soon as I talk, I get the RF. If he ends up not sending me money, are there any changes I can make that will remove the RF issue? Not happy. I paid for an SM-6. His photos included an SM-6 manual. He even sent me an SM-6 manual with it.