Sorry to resurrect older thread. The slide on my Beretta 85f (similar metallurgy to your 92, I'm guessing) no longer reliably stays locked open on last round. Most of the time it stays locked, but about every 3rd magazine it does not. The magazine follower is not worn, and I tried replacing the mag spring, did not help. The slide stop lever is not visibly worn, but the notch/hole (whatever it's called) on the slide that engages the slide stop lever is visibly worn, rounded, and unfinished shiny exposed steel. I attribute this wear to using the slide stop lever to feed the first round. I have owned this gun since new, and I've probably put about 1000 rounds through it over the years. I'm kind of bummed about this issue, and I will no longer use the slide stop as a release on any gun I shoot, despite what others may say to the contrary. Some guns may have harder metal, better design, etc, but to me it's just as easy to pull the slide back manually and avoid the potential wear.