Alfred de Vries produces the Beaumont air rifles in the NL. I think they are based upon the Daystate MK3 platform?
I know there is a poster on the YF that has a couple of them, try searching there for reports and pictures.
I can tell you from me where you can find a real way to learn more about thermal imaging cameras. I myself, for example, needed them for our unit.
Luckily I was able to find them here https://www.agmglobalvision.com/thermal-imaging and I’m very happy about that. I hope I can help you as well and it will be really helpful to find out as much as possible. I was able to order here and these thermal imaging cameras have already proven to be very effective.