>>64010352
Gen 3 Beretta locking blocks last around 35k rounds per what I heard, but the recommendation to replace them every 15k-20k is still there since they're like 40 bucks.

https://www.youtube.com/watch?v=ue8_uN0OIVs&
Ben Stoeger has several hundred thousand rounds through Berettas. He claims to have 100k through a single pistol without any locking block breakage.