True, if you are knowledgeable of what is critical and what is not. A new collector without such knowledge can wind up with a boat anchor."parts guns" aren't necessarily bad... for instance ones that have been overhauled ("Wx.xx" marks etc) typically have good parts like the reinforced slide and forged locking block. The hex pin is a red herring, it was added to reduced the wear on the frame from the steel lock block, NOT to strengthen it (it in fact weakens the frame by removing material at a critical point). Unless you'r going to shoot the poop out of it, the pin is not needed.
If I was building a shooter, I would use the "fat slide" and forged lock block (and on a steel WW2 frame and barrel, but those WW2 parts are very expensive now).
View attachment 447363 View attachment 447362