I have had the same problem with the 9 round mag, i took the spring out and stretched it out about an inch and it cured the problem, but most likely it will be a recurring problem.
Good information!!!Highspeedlane said:If you disassemble your mags and taking only the follower, turn the mag upside down so the open base is facing you and drop the follower into the mag body, odds are it will stop around 1/4" short of the feed lips and require a bit of pressure (such as with a long punch) to fully bottom out at the feed lips.
I just remembered when my LC9 was new I had the same thing happen. Mine would not lock back on just an empty mag (manually cycled without firing) so I was thinking "what the heck?"
Ended up doing the above and discovering that the molded plastic followers Ruger used for the LC9 mags I had were a bit rough around the edges. There was just enough irregularity in the straightness of the magazine body that the mag followers were getting too tight toward the top of the mag.
I took medium sandpaper and being careful not to overdo it and cause additional problems, smoothed out the follower where it was binding inside the mag body until I could drop it into the mag body and it smoothly slid all the way to the feed lips by its weight alone.
From there it was smoothly locking on empty. I don't advise you change the geometry of your mag follower unless you are extremely confident in your abilities. It may well be something shooting a few mags worth would fix on its own but I think that an out of the box pistol shouldn't have an issue like that.
