The gun shop where I buy guns would take that gun back with no questions.

If I was you, i'd send the gun to TC and tell them the gun was sold to you as a new gun. I'm positive they will send you a new gun, and will be very interested in who's selling their guns in that condition.

I don't blame you for being mad, but don't blame TC. Let TC make it right for you, and straighten out that dealer.