Finally!

Just got a scope mount (weaver) to fit my Crosman Mk1. After a bit of research found that a Ruger Mk1/2 mount would do the job, and lo and behold, it fits a treat

The whole ensemble now somewhat resembles a Star Wars blaster, but I'm finally happy with the set up. My thanks to UKNeil for the mod adaptor, Matt W for the delrin mod and the company on the Bay for the scope mount. Just got to get the new red dot zeroed now