@Gila
Now you have me curious, and its a 6mm which I have a ton of ammo for. I will pay shipping to have it sent to me. I will test the barrel for you on video. If it shoots, you can pay for all the shipping and you get your barrel back. I will include some crow for you to eat.
If it doesn't shoot, I will personally talk with Preferred barrel and get it sorted. If necessary, I will personally refund you the cost and keep the barrel.
There is no better offer you could get for that barrel now that you have besmirched its reputation.
Put up or shut up...