I wondered too. I even thought about 3-D printing. but then I checked out the MG42 video. When you look at a close-up of the trigger guard, it's obviously wood. I'm not ruling out the possibility that there might be CNC involved, but if it's truly done by hand, I have to take my hat off to him. Who's to say how other people pass those long winter nights? Perhaps this quarantine will give him the opportunity to get started on that 1:1 Bofors gun he's always wanted to do....