Lots of choices for spot lights out there, hand held, gun or vehicle mounted and many work great for night predator hunting. For gun mounted I've used the Optronics NightBlaster's, and they do have a 30mm scope mount available for their 100, 250 and 350 yard models in both variable and non-adjustable beams. I've also used Light Force 400 and 600 meter beams, and they come with a mount that will fit 1" to 30mm scope tubes.
It's worth the higher cost to get the variable beam version of either brand IMO.