And one more time Browning did not use a newer cast frame because it was superior to a re-designed newer forged frame that could have had the same heat treatment to it. They used the cast frame because it was cheaper to make.
While this may be true, you write as though you have inside knowledge of why FN
did what it did when redesigning the gun. What was the source of your information?
One of Browning websites (Stephen Camp writes there...) suggests that the cast frame is harder and tougher than the forged frame, and allows the slides to be heat-treated to a higher level of toughness as well
. If so, the decision may have not been solely one of cost savings as you claim.