As of today I've bought 3 rifles and 4 pistols from Gunbroker without any problems. All new, however if you are buying used be careful. I was going to buy another 1911 then I noticed the left hand safety was missing. When I callled the seller he tried to minimize the fact that he didn't disclose it.
With used stuff it's definately buyer beware.
Experience is a very bad teacher because it first gives you the test and then teaches you the lesson.