I traded a WASR with 3 magazines + $200 for a Colt Series 70 1911 in stainless, best gun decision I've ever made.
Alternatively I stupidly traded a Colt Commander (unfired still in box) for an auto ordnance thompson carbine which i later sold to buy a big TV (I know I'm a knuckle head)
I traded a Beretta 9mm 92 Centurion + 100 dollars for a Bushmaster M4a3 that trade still makes me smile.
I sold a Mossberg 590 with a knoxx stock for a loss of $200, but I don't regret that at all, gun was just way to big for me.
Traded a 10/22 stainless for a blued 870 Wingmaster made in the 50's. that was an especially good trade, because I was given that 10/22.
Oh and I traded a full tank of gas for a Mosin-Nagant M44
All and all I did well, but I wish I still had that colt commander.