Points
Used one a long time ago - could never quite get the hang of looking straight ahead with one eye and having the red light blaze into the other - always made my head ache and went cross eyed .
Maplins have a lot of battery compartment components - maybe something there could be soldered into place - or use one of their double AA holders / nylon coated wire and a jack plug and socket - and have the batteries stuck to the side of the airrifle - plug in to play .
" WHEN YOU'RE GOING TO SHOOT - SHOOT , DON'T TALK ! "