Recently read that the Browning Hi-Power suffered lock failure in some of the early versions. The article indicated that some have what are called "round lugs" and some had "square lugs".

I also recal a safety warning coming out in the early 80's about locking lug failures in the armies issue Brownings, but I thought at the time they were suspecting over presure French ammo as the cause.

Anyone know what the story is regarding potentialy flawed 9mm Hi-Powers, and how would you recognise the round or square lugs, if it is a real problem?