Interesting question. I’ve had absolute miserable experiences with two custom rifle makers. Both of whom I would never recommend. For one project, I ordered a Getz barrel. After many years of nothing but excuses, I finally received the item purported to be a custom flintlock rifle. Immediately after opening the crate containing the rifle, I ran the ramrod down the barrel only to find a sizable obstruction. It was removed carefully and photographed. The bore was a sewer pipe. The self proclaimed custom builder could not or would not explain how the bore was so damaged. He offered nothing.
I contacted Getz via telephone. I explained my concerns for the barrel. I sent the barrel back to Getz for his inspection and opinion. I also told Getz I would pay to have another barrel made. The barrel was inspected. Getz did not clam any responsibility for the condition of the barrel. I reminded him I would pay for another barrel.
To this day, ten plus years later, I have not received the damaged barrel back, or the new one I requested. No answers on the phone, nothing. So, Getz gets a thumbs down from me.