Depends on the gun and what you want to do. I've sold to my LGS quite a few times. They usually have another gun that I want and their prices are right most of the time.
Example: I sell them my $500 gun and they give me $400 for it. They have a $700 gun they'll sell me for $600. They gave me $100 less for my gun but they sold me another one for $100 less as well. So its a wash. But they only charge me tax on the difference...in this case, I would save $28. I've had this exact scenario with them several times.
Example: I sell them my $500 gun and they give me $400 for it. They have a $700 gun they'll sell me for $600. They gave me $100 less for my gun but they sold me another one for $100 less as well. So its a wash. But they only charge me tax on the difference...in this case, I would save $28. I've had this exact scenario with them several times.