Fairly certain others on here have a better solution, but made a poor man's IR setup using an old smart phone with the glass IR filter removed from the camera and an IR spotlight.
Takes some fussing to get far enough inside the phone to get the lens out of the camera without damaging it, then it needs to be re-assembled and attached to your scope, then a hood over that to keep from showing all the light made by the screen, but it does work. Made the mount for the back end of the scope out of an old PVC pipe heated and bent to fit, and the hood out of an old blanket. Ordered the IR spotlight off amazon - they're used in conjunction with IR security cameras. You can get IR lasers and torches on there as well - probably worth having an IR torch on the airgun too, though I didn't have one. Looked dumb, but it worked, cost next to nothing using a junky old phone, and never had a rat catch on to what was going on (until it was too late).
If you don't fancy doing open heart surgery on a smart phone yourself a phone repair shop would probably do it once you explain what you want.
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