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For whatever it means they spec is listed as:
Frame: 4140 Steel
Slide: 4140 Hammer Forged Steel
To which I think that pretty much all frames namely the Philippine made ones start out as castings as to mill from billet would really raise the cost a lot of $$$ to which the same is to be said of the small parts they are in all likelyhood MIM as they are on guns costing quite a lot more. Sorry that I don't have more detailed answers for ya.

 

its a cast frame but that not a big deal Lots of 1911 even some pretty expensive ones are cast.


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Most slide stops are MIM these days. My new Kimber has some MIM parts. I agree with what MichaelT says...

 

I think any slide stop thats MIM should be replaced . Buddy had a new Springer few years ago we were shooting and slide stop broke . If you going to carry or use for SD then change out for a Wilson or Brown . Buy the best.
For price I think Kimber has 2 many MIM parts