Cracked

Tam made a post a while back talking about the 10mm's propensity to crack the frame right above the slide stop cut-out.

Colt's solution was to open up the cut-out all the way.

What I noticed today was that 10mm isn't the only place they've done it.  My .38 Super came with an open cut-out too.

By way of contrast, my 2006 Springfield USGI in .45 is thus:

Marv's 1983 made .45 is from before the change.

It makes me wonder if .38 Super had the same cracking problem as 10mm or if Colt just made the change to the cut-out on all of their 1911s.