Very sorry about your father !! Darn cancer took my mom & mother-in-law . As a retired nurse my thoughts and prayers go out to you and your family ! Thanks for sharing your story and keep shooting it's good therapy .
When the CM-2 was being sold in the early 2000's, they were marketed as the Adult and the Cadet. Yours is the Cadet. The Adult model has a longer stock, heavier, longer barrel and only the back top of the receiver is grooved for sights. The Cadet is grooved front and rear which makes scope mounting easier. I believe the rails are 9.5mm rather than the European normal 11mm. As you demonstrated by your shooting, they are very accurate rifles.
Nice shooting. Super cool rifle 👍 Glad we can comment! You have comments off on a few vids, don't know if you knew this? Take care, and I'm glad your dad is doing better! 😊 🙏