If the 1911 didn't exist, who's to say the modern handgun would be like it is now at all. Many guns based their designs and operations on the 1911 design, so perhaps these designs would not exist at all.
I'd guess maybe the Beretta 92F/FS would be somewhat popular, since I think that gun wasn't really built with the 1911's inspiration. And it was all the rage when it came out in the 80s, with its 15+1 capacity and its soda can frame
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