To make an offer, simply click the "Make an Offer" button on a used gun listing if it appears. Then, enter the amount you'd like to offer and click submit. The seller will then have 24 hours to consider your offer (and any others they may have received on that gun) and either accept, decline, or make a counteroffer. If they make a counteroffer, you will have the opportunity to accept or decline. You will only be allowed to make a single counteroffer, after which you will not be allowed to negotiate on that item for 30 days.