It is a difficult one.

If the returns policy is without conditions, refund the buyer and charge shipping to him.

If the returns policy is only to check that the gun is as described, don't refund him unless he has cause to argue about the description vs the gun as it arrived.

As a seller, you have to bother with tyre kickers and time wasters - so apply thesecond condition.

As a buyer you worry that buying a gun unseen is a risk - afterall you can't really get a feel for agun unless you have it in your hands.

The solution? Don't buy or sell on the 'net.

or Make sure that teh stated policy is clear from the start and adhere to it.

My advice for what it is worth - Jim, give the chap a refund for the sake of a happy client, make very clear what your returns policy is in future deals and put it down to experience.