Interesting you picked the Beretta 92 since it is a design from Mr. Beretta from the 50's and clearly a candidate for C&R class...
However still a viable firearm like the colt 1911.
Originally Posted by Jim K
Section c is the one usually cited when asking that a modern gun be added to the list. To make up an example, an importer finds some Beretta 92's in Bongo-Bongo that were made as a special order for the Bongo-Bongo palace guard, all engraved and with the Glorious and Noble King's crest. To ease importation and sale, he petitions BATFE to declare them C&R, even though the Beretta Model 92 is in daily production and is a modern gun.
Chances are that BATFE will approve the request and add those guns to the C&R list as "Beretta 92 made for the Palace Guard of Bongo-Bongo, engraved and bearing the Royal arms of Bongo-Bongo inscribed by the factory, and having serial numbers BB1 through BB200."
Note that this is totally separate from the general 50-year rule, and was being done long before there ever was a 50-year rule.