From The Truth About Guns:

Fincher, 52, has had a federal firearm license for three years. He has no brick-and-mortar gun shop. He’s what used to be called a “kitchen table FFL.” He sells most of his firearms at gun shows, including Wanenmacher’s Arms Show in Tulsa. 

“It was like the Trump raid. They called me out onto my deck and handcuffed me. My son was there and saw the whole thing. He’s 13 years old,” Fincher said. “They held me on the porch for about an hour. I was surrounded by agents. One by one, they yelled at me about what I was doing. In my mind I decided if they were going to beat me up over every little thing, I’m done. As soon as I said, ‘If you want my FFL, you can have it,’ one of the agents pulled out a piece of paper and said, ‘Well then sign here.’ He had made three copies in case I screwed one up. It was exactly what they wanted. I was shocked.” 

“You’re done. We have to shut you down,” Fincher recalls Mongell saying. “You tell all your FFL buddies we are coming for them. We are shutting the gun shows down.”