Beretta recommends replacing the locking block after......(can't recall the exact number off hand) say 15k rounds. In addition, the newer locking blocks are supposed to be stronger.
Originally Posted by JonM
IThey fail at the locking block long before the barrel itself will let loose.
When i was doing the armorer thing I sent m9's to depot if the locking block was cracked or broken for barrel inspection as I didn't have tools for that. Replace a block yes, inspect a barrel properly no. I didn't take chances with my buddy's weapons.