Got a S&W M&P 40 C with four mags and a Comp-Tac Infidel holster from a buddy moving overseas. He said he thinks he fired about 500 rounds out of it. I got this package for $400. How did I do? Is this a decent price for a used gun considering Cabelas is selling them for $425? Anything I should now about this gun? I'm a Glock guy and can't seem to find a lot of info on it considering how new the model is.