Why do you want something you can load from the top as a truck gun ? I've carried alot of different rifles as "truck guns" and always considered ones with detachable magazines the best for that purpose. Keep a loaded mag in the center console and you can pop it in and chamber a round more quickly, with less fumbling than you can load a single round in a top loader.
He doesn't live in that schit hole you do, you fugkin' moron.
Dave