I cannot help with your specific question. If you called and were told that it would be covered and now they are charging you I understand your frustration. But, I also know that warranty’s have specific language, durations, and exceptions.
What I can tell you is that AirForce Airguns are made in Texas by tax paying Americans. The owner and his wife work tirelessly running and promoting their business and doing what ever they can to promote Airguns in America. Almost every Airgun Show I have ever attended has had at least one AirForce Airgun donated to be given away as a door pride or raffles away to help offset expenses.