What a pointless ritual of symbolism. This did absolutely no good except as a propaganda stunt. On the other hand, I would say don't ever buy used guns anyways. Support the gun industry and buy new ones and increase production, instead of just recyling old ones on the market. Hell, keep your old ones or give them to family members or friends who could use a good firearm, then encourage them to go buy new firearms next time.
Philosophers have understood that the the symbol is not the thing for a couple of thousand years, but waterheads like this and like those school administrators who suspend kids for drawings of guns or for a tiny symbolic kirpan still think this way.