The 92/96 Beretta has a locking block that has lugs on either side that engage the sides of that thick slide. This differs greatly from the Browning inspired lock up on the 1911, Hi-Power, SIGs, Glocks and HK pistols. It is more like the Walther P-38 system.
Here is the Wiki page on the 92...scroll down and you'll see how it operates. Look under "Operation" it explains it all.
IIRC the Italians copied the locking block design on the Berreta's from Walther P-38s they got from the Germans during the war. Infact if you compare the two side by side they almost look the same. The recoil spring setup is diffrent though.
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