Too tough to say. Marlin 60, marlin 336, 1903a3 m14rem700 all are in the running, but on this one I'm going DEEP for my response, Red Ryder BB gun that started my obsession. I have worn 8 of them out to date and no, they do not make them like they used to. They now are weak and last at best 2 years. My first lasted from my 8th birthday through middle school. After that it has been a downhill slide. I'm 29 so that puts me at around 2.5 years per gun on average but the ones from the early 90s were great.