Sent me a wrong item, I thought it could be a mistake, reached out to him again. Stopped answering emails. My fault for paying with FF Paypal.
Ouch.
Would love to see what his reponse is at this point.
Otherwise, I am certain a ban is incoming.
Never FF unless it’s an FF. 
I just hope it wasn’t in the hundreds. But, why they would send anything at all is my wonder. Could be a mistake, guy is waiting on another buyer to ship your item back? I dunno… Weird though why they would even ship something if they were going to rip you off.
I bought AAC Breakout and Blackout muzzle devices. He sent me Blackout and Blastout. He definitely knew beforehand, because i asked him what version of Breakout, and he responded “2.0”. And the item he sent me, actually worth a decent amount too, just not what i bought. His inbox is full, so i sent him an email, that we used to communicate earlier, waited 2+ days to give him time. I thought it could be a mistake, but at the end of the day i got a wrong item and he doesnt respond.
Sounds like a mistake to me, possibly, out of ignorance. Give it a little more time, especially if his inbox is full. Good luck.
Few more days passed, few more emails. The guy is a scammer.
If this is not resolved you should leave a negative feedback score.
He replied to my email, weeks after. Claims it was a mistake and thought thats what we were talking about. Unlikely , because i asked him specific questions about. But whatever, ill let it go.