When I first encountered the Caspian slidea and frames many years ago, I heard that they had been supplying parts to Detonics. Of course, Detonics never really got that many guns out there to give us a good read on durability. I have an old parts gun 1911 built on an Essex cast frame, and it's provided good service through many thousands of rounds.
I think forging does give you a tougher frame, but for a 1911, the casting seems to work.
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