I agree with everything said above. Give it a good cleaning, shooting it, and if still and issue call ruger. Mine was new and it look a few trips to the range for it to loosen up.
I also see the same thing as dalon, where it is stiff after I tear it down, but again once ai shoot it a few times it is good to go.
I have had to call ruger once (I have 6 of their handguns) and the service was great. Just as stated above,I told themtheissue, they emailed me a shipping label and I got it back within a couple of weeks.