>>63870827
I would personally not want a big mag funnel extension on a carry gun like that, and a Beretta 92FS mag already holds a whopping 18rds flush (and remember, you can load +1), so I don't feel that the stendo is particularly necessary, but overall it'd probably work.

>>63870833
A stock Beretta 92FS weighs like 34 ounces empty, that one with the slimmed down grip frame probably weighs a little bit less. Heavier than some plastic framed pistols? Maybe, but not by a colossal amount.

Sig do also make metal framed guns still.