very intersting - i have a 1991 Beretta 92FS that has a stainless steel frame. i knew the US made ones were alloy and rather thinly plated, but didn't know that the later italian inox models were also alloy now. my bad, guess we can take the inox off the list of steel beretta framed pistols. come to think of it i wonder if the PT92 still retains a steel frame in their modern incarnations? i know the PT99 is aluminum alloy.
Ashbury Precision is pretty high up there, even on weird pistols.
My Italian Inox 92 is an '07 I believe. I'm pretty sure the 92 Inox has always had an alloy frame, with all other metal parts being stainless. I'm actually fairly certain that the 92 series has never had a steel frame outside of the new 92X pistols and the classic 92 Steel I, which could have been SA/DA with the old thumb safety or SAO I think. My Italian Inox came with a stainless trigger, but a silver plastic mag release, which I replaced with a stainless extended one from Beretta. It had the new black polymer guide rod too, which I also replaced with a factory Beretta part. All other controls are stainless.
Your 92FS Inox has an alloy frame. Probably a straight dustcover, no "magazine warning" on the side, no scallop on the grip.
There are so many obscure models of the 92 that you could probably find one that I didn't cover, but if it said just "92FS" on the slide, it had an alloy frame.
I own three different versions myself. An old 92F (the gun of John McClain, the actual M9, if you're gun autistic, you know the 92FS is different, only slightly)
The Inox, and a somewhat cursed 96G Centurion, with a stainless barrel. A certified hood classic, even if its not the greatest .40 smith pistol. It's an old 96FS Centurion frame with an NOS 96G Centurion slide and stainless barrel, somewhat of a franken gun. I don't shoot it much.
I'm pretty sure the standard Taurus PT92/99's are all alloy, too, seeing as how they all fell out of the og Beretta 92 family tree. Heel release PT92 magazines interchange with the Beretta mags, iirc. Taurus mags are currently different because they designed the mag release in house when they moved it, they didn't copy the 92F.
I also gave in to my blue balls and picked up a lightly used FNX-45 with Vortex Venom for like $950 otd locally, so I won't need to send anything off for machining now.
If you can, go fondle a 92X at your local gun store, they're significantly more heavy than a 92FS, like an SP01.