Some people have issues with a gun and then get rid of it because of this. Just read the various gun forums and see when people complain about a problem.
I know there are some members here who swear that they ONLY buy used guns - for the cost. And, I guess some people are paranoid and don't want to fill out the form with the serial # on it.
But, the only way I would buy a used gun would be to shoot it first. Not always an option at a gun store. But, if U buy from someone locally in your area, U could meet them at a gun range and try it. Out of all the guns I sold over the years, only 1 buyer insisted on this. And, this is the smart thing to do. Only way I'd even think of buying used.
I personally prefer to buy new. U get the warranty, which doesn't always pass on a used gun. And, its just my preference. I know the history of the gun if I am the 1st owner. Some members here will countermand me, as I said above... Some people love to buy used guns... As a 1st gun, though, I think U should buy new...