I love ALL of his books and have read them all including American Gunfight. Only big mistake I have come across was Bob Lee's father checking the chamber of his Thompson SMG to see if it was loaded (LOL!!!!)
I've got most of his stuff. The earlier stuff was really good, the later stuff like Soft Target (I think that's the title, dealt with a mass shooting at a huge mall. Kenyan training manual perhaps?) felt very much like it was a rushed, thrown together, check the box for a thriller effort.
Didn't care for American Gunfight at all.