I have always had really good luck on Armslist.
I was able to get both a 74, and a WASR for ridiculously good prices last year right before the UBC.
Sold a pistol and shotgun, and both times the buyer was legit and not a mouth breather.
HOWEVER. I have had shit luck on VAgun trader. I have only managed to close on a Larue rail, and I would either get tire kickers on my ads, some fucking new account asking me to trade when I want cash, or offer cash when I specify trade only.
What really pissed me off was last year before the UBC, guy listed a stripped lower for a bit high, but I was still ready to pay cash since I wanted one more. I was even in his area and messaged dude about it. He responded that "since I only have 12 posts, and don't post in the hangout chat I'm probably a felon trying to avoid a background check". He then blocked me before I could even respond with a reference (my brother who was buying three different guns that day from sellers on there)
So now I don't really even bother with it. The person who described it as filled with the guy wearing BDU's open carrying a Judge who hang around fondling guns at gunshows smelling like fart cheese, nailed it.
Maybe now that Armslist has gone off the deep end, it will work out for me.