Being a Red Box gun, I think it would be safe to assume that it has been through the factory upgrade.
You didn't mention which slide/frame size you bought, but it it was the FS you might find the recoil spring a little stiff. A common modification is the change the guide rod and use 1911 springs to tune it for the ammo you plan to use.
Another thing to keep in mind is that when reassembling the gun after stripping for cleaning, but sure to use the slide stop lever to lock the slide to the rear before rotating the take down lever into position.
The great thing about the P320 platform is that you can mix-n-match different sizes of slides and frames to fit your desires. If you get a chance, you should try on of the "X-series" frames...it really changes the "feel" of the gun