The first thing I do with any gun, new or used, is to strip it, clean it, and lubricate it. With used guns you never know what you'll find, usually filth and a couple coils clipped from the rebound slide spring at the least. With new guns, sometimes bits of metal left over from machining and absolutely no lubrication whatsoever.
A good cleaning and lubrication, I use gun grease on all contact points, and the gun will have a much better action then it did when you started.
I have to say I'm quite surprised by the amount of people on here that won't pop a sideplate off! I like to be completely familiar with my firearms.