RX- My personal experience says the design is faulty. 3 (or more) locking block designs that were all supposed to address the faults of the previous design(s). If this had been a parachute or critical aircraft component, what do you think would have happened? One wing of the 2? You need both, and when 1 breaks, it often becomes lodged in the pistol.
What round count are we talking about? How many rounds will a gun with a new slide and locking block fire before the block fails?