"Stiff" is a subjective term.... what I and you might consider stiff could be much different in someone else's opinion. I prefer to have a "firm" latch/spring on the magazines so they don't fall out easily. I would make sure there is nothing in mag well up by the mag release and lube it. You could order a factory spring.... or just call Ruger and they might send you one to try. I am not sure if there is an aftermarket spring, but you might be able to google it or someone might chime in and let ya know.