The only guns that get turned in for buyback programs are those that are junk and only worth the amount they get.
http://usnews.nbcnews.com/_news/2012...-the-idea?liteQuote:
“The guns typically surrendered in gun buy-backs are those that are least likely to be used in criminal activities,” the report says. “Old, malfunctioning guns whose resale value is less than the reward offered in buy-back programs or guns owned by individuals who derive little value from the possession of guns (e.g. those who have inherited guns).”

