Beretta is now putting a radius on each side of the locking block "ears" where the cracks were prone to form. That should alleviate the stress that used to cause breakage, and thus you should get plenty of life out of the locking block. Exactly how long it'll last is still a matter of chance, depending on various factors. Basically, if you can get 20,000 rounds out of ANY pistol before something important breaks you're doing pretty good.