MC 1911, apparently you are not familiar with GunBroker, or else you didn't read the OP carefully.
Re: GunBroker, if bids do not meet the reserve price, then the highest bid is not binding on either the bidder nor the seller. This auction ended with the reserve not met, so no binding sale was made.
Re: the rest of the OP, the seller then emailed the OP with a counter-offer, which the OP has considered but did not agree to. Since that time, the OP has learned from posters in this thread that the gun does not appear to have been accurately represented in the ad.
Your opinion on this seems to be that one-sided contracts are somehow binding, and that lying in an ad should not factor into the decision making process.
Perhaps you should ask the OP for the seller's info, so you can buy the misrepresented weapon at a stupid price.
One last thing - had the OP won the auction, but found out upon receipt that the gun did not match the box, and that it had also apparently been re-blued, he could have demanded the seller buy back the gun. Management at GunBroker would most likely back up the buyer, at least to the extent of banning the seller from listing more items.
So please tell us again how the OP fails to meet your ethical standard?