Make your offer. Be polite and have money in hand to back up your offer. You'd be suprised how many people are rude if their offer is declined or worse yet who can't complete the deal because they don't have the money. If my offer is declined I thank them for their time and move on. Sometimes you can leave your contact information and get a later call back with a counter offer. But don't waste your or their time. Everyone hates tire kickers but not so much people who make legit offers, even if low.
Problem is you think you know the guns value, to you, not the seller. You don't know how much they have in the gun, what their margin needs to be or even if it's a consignment gun with an owner expecting much more than it's worth. Many high end sellers are just selling a gun on consignment so they can wait years to get their price. Top condition guns are almost window dressing for their websites.
