Reason I ask is Gunbrokers automatically adds sales tax to the invoice and seller has to send it to me. Then GB charges me on my CC for the tax collected.
Does GI work the same ?
No- they do not.
Dealers who sell there collect tax on sales within their own states.
Since Gun International is simply a listing service and not an Auction site that also handles the payments, they do not collect sales tax on behalf of the sellers.