Don't trust Craigslist. Be cautious of anyone selling a gun from home that you don't know. The gun could be hot...you could be set up. They can take to a gun dealer and sell on consignment or you could meet them there. The world is replete with examples of countries using gun control resulting in millions being killed. The Founding Fathers were quite smart to try to limit the govenment. That's right, not to limit the people, but the government.
The only massacre I'm aware of in the USA was when some Mormons convinced the settlers going to California that the Indians would kill them unless they gave up their guns to show they were not a threat to the Indians and the Mormons would escort them to safety. Once they gave up their protection they (120) ...men...women...children were killed in what is known as The Mountain Meadows Massacre in 1857. Years ago I would never have thought the things I have seen the last few years would ever happen...but they did. Here is a bit on gun control across teh globe...across time that many need to understand the patterns...