Look in the "Sans-Serif" section. Click on each font then scroll down to see the whole alphabet. Find one you like.
I can't find a high enough resolution picture of the slide stamping. I can't tell whether or not the letters have rounded or flat tips. Maybe if someone actually has a Beretta 92 on hand or a very good replica, they can tell you. They are probably round-tipped, but I'd want to be sure before getting to far into the work.
Here's a better example. Looks like the fonts have slightly rounded ends, and not the flat/sharp ends unless my eyes are messing with me... which is entirely possible.
Still haven't found a perfect match yet in free fonts. Or any font for that matter. Many "close-ish" but none spot on.
The middle line of the letter "E" could be a little shorter, but it's pretty close. Going to try and match up with my source image and see how it works out.
Thanks for the suggestions, and feel free to share if you find one that's spot on.