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Old January 27, 2021, 12:24 AM   #10
Aguila Blanca
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Join Date: September 25, 2008
Location: CONUS
Posts: 16,019
Definitely not a good idea, and maybe not even possible. For future reference, bookmark this link:
https://saami.org/technical-informat...mber-drawings/

That page will take you to official SAAMI dimensional drawing for cases and chambers. A quick look will show you that, although they both shoot the same diameter bullets, the 9mm is larger in case diameter, and also has a taper where the .380 ACP is straight walled.
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