Thread: Thermal, clip on

Hi, wanting to get some advice, I have a dedicated night rifle with a pulsar thermal ,and a handheld thermal. Wanting to see if buying a clip on would be successful to have to let other shooters use or fit on my .223 so I can shoot hares etc…
Are they any good? What ones ? Do they come able to fit varies scope sizes ? Appreciate any advice. Thought may be a cheaper option . Cheers