Some rings are file to fit... some are not. It should be checked regardless, and I run the 2nd ring gap larger, so I end up filing thme a little anyway. The file to fit sets are .005" larger than the finished bore size...
I allways check them too no matter what type or brand. It only takes a few minutes then you know it's right. I knew a fellow once that didn't check his and they must have been on the tight side cause before it ran 25 minutes to get the cam broken in a set of rings butted together and pulled the top off a piston.