Sorry, just realized that I posted in revolversOldePhart said:The LC9s is a revolver, now?!
Seriously, I had the same issue with the USA made magazine that came with mine when I had it. Had four Italian mags and they worked fine. My USA mag didn't drop under recoil as some report, but it would release in my IWB holster every time I turned my torso to get in or out of the car.