[OCG1911]

That is exactly what those dimples are from castings. Like Metalsmith said nothing to worry about the only stainless slide stop that is not cast is an original Colt they are also available from Brownells under the Colt factory parts section.OCG1911

 

[OCG1911]

All of the Ed Brown slide stop's are from a casting then machined the Hardcore is cryogenically treated to relieve stress and supposedly giving a longer service life.Some of the print is tricky unless they say machined from bar-stock it is safe assume it is a machined casting.OCG1911