Like the title says, I'm curious where used airguns wind up. I've seen one or two at garage sales and I've seen a small few on well known sites like gunbroker. But I feel like there should be more used airguns. Like the old single-stroke pneumatics for competition that were displaced by CO2 and then PCP. I've never seen one of those for sale and I've kept my eyes peeled. Similarly the older crosman 1077s can be adapted to take larger CO2 canisters while the new ones can't. Those older guns would be desirable.
Are airgunners just more likely to hang on to them and pass them on to their kids? Or are they snapped up really quickly? Or is there a site my google-fu is unable to find where the swapping goes on?