I have been asked by one of the Hunter Ed instructors that I teach with what would be the best BB gun for us to use in our HE classes. The guns we are currently using are getting worn out but they are only 2 or 3 years old. Between using them at 5 or 6 classes each year with about 40 students in each class and taking them to other venues to introduce people to shooting, each gun probably fires several thousand BB's each year and he is getting tired of replacing the guns so often. I would appreciate any suggestions you have of guns that are first and foremost durable and maintenance free, and second somewhat accurate (at least can hit a 2" diameter black circle from 25 feet somewhat regularly) We are currently using pump guns instead of CO2 guns to help keep cost down and we also seemed to have more trouble with the CO2 guns. Thank you.