They might be MIM parts but if so they are very high quality because I see no evidence of a sprue hole.
I still don't understand the panic over MIM parts. Almost every 1911 now uses them and if they were as bad as some say there shouldn't be a functional 1911 that was made after the turn of the century.
Of the two posted, one has four ribs and one has five ribs. Most RR and Ithaca slide stops that I have seen recently have five ribs, although a few have four ribs. Were those original to the guns? Who knows. Some that I have looked at also have less prominent serrations than the ones that you show. There seems to be a considerable amount of variation involved.
The length of the serrated part of the slide stop looks about right on yours. Many of the later non-GI slide stops have a longer or shorter serrated section.
I also looked at what Joe Poyer has to say about this. He refers to the five rib slide stop as a Type 3 slide stop, which was used by RR. Ithaca, and on some Colt commercials. The four rib is a Type 4, used in post-WW II Colts.
I submitted an offer for the top one. They both have 5 serrations if you look close. I closely compared both of your slide stops to my broken original piece and they are, in my uneducated opinion, correct type 3 serrated slide stops. BTW, R.Rand, Ithaca, and Colt all used the type 3 slide stop in late WW2 production.
Here's the slide stop on a 1944 Ithaca. It's really hard to say if yours are WW2-era USGI or not. So many of these serrated slide stops have been made post-WW2 that it's pretty difficult to ID a proper WW2-era part anymore.
The one I changed out was on a Remington Rand, which is why I didn't show it. This Ithaca stayed in the vet's garage for several decades, so it is most likely all original.
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