A while back I bought a used Marlin 917VS. The first time I took it to the range, it seemed to have a light-strike issue about every 7th or 8th round or so. I even tried four different types of ammo with the same results. Any ideas? I plan to break it down and do a thorough cleaning and bolt inspection. I was trying to find the specs on this on Marlin's web site, but they don't seem to provide the info any longer. Thanks in advance.