About 12 years ago, my dad wanted to trade in his Remington 740 .30-06 rifle in order to get me my first rifle for my 18th birthday. We were at Cabela's at the time looking at the used rifles in the gun library. My dad had talked to one of the associates there about trading in his rifle or selling it to them. They said they could not offer anything or take it in, because of an issue these rifles had, and never got officially remedied. What problems did these rifles have that would cause a firearms dealer to not take it in on trade?