If you have the money, get the Atlas Chaos. It's only a 3 month wait, great gun guns right out of the box. If you buy a used gun you could be buying someone else problems or your buying a gun that's out dated. Not saying that a old gun won't run but, saying the guy it my club sold a older open gun 8 yrs old, brand new barrel in it. But it had the plastic grip and a slide ride on it. He sold the gun for $22k not a bad price. But if you up grade the scope to a min dot and a EVO grip on it your putting 10k more into it. Then add popple holes. Your getting there in price.