I've had pretty decent luck on Armslist...better buying than selling for a lot of reasons already mentioned. Mostly it's because people suck.
First gun I sold here was a Taurus PT-111 NIB that I got on a trade but didn't want. I listed it for $200 as that's what they go for...but it was a private sale so no BGC or tax. Guy from near Coeur d'Alene calls, offers me a low-ball price to which I said "no". He then agrees to the $200 if I'll deliver. "No". So then he says he'll drive to Lewiston and we meet.
Then he says, "Oh crap. I only brought $190...I thought I had $200." I told him that's too bad cause that's a long drive to go home empty handed. Then the other $10 miraculously appeared in his "other" pocket. I told him to pack sand and have a nice drive back to CDA. He got all pissy and said he was gonna "black list" me on Armslist. Fuckin' stupid people. Sold it the next day on Armslist for $190 to a very nice young lady who wasn't an idiot.
I've sold 4 or 5 since without any issues.

