I think that if you read my posts, I never said you couldn't use forgings in the extrusion process. The question is what is used in RIAs? The answer is that nobody knows for sure but there is some circumstantial evidence a couple of years ago that it wasn't forged steel.
Edited:
Okay, I was going to email RIA and ask. I went to their website and, lo and behold, on their FAQ page was the following:
Quote:
What are your frames and slides made out of?
Our 1911 Frames are Cast 4140 Carbon Steel and our Slides are Forged 4140 Steel.
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So, the slides are forged. The question now is whether they are still using the extrusion process but that's a different issue altogether.