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AR15.COM
12/21/2025 11:13:59 PM EDT
Is this possible with just a barrel and magazine swap?
12/22/2025 12:31:05 AM EDT
[Last Edit: jwliv180][Edited] [#1]
Don't know about the mags question, but at least one company does make .40 to 9mm conversion barrels. (For the full sized anyway, I didn't check for the compact.)

Fwiw, I've always had good results with their barrels, but I've never bought a Beretta barrel from them.
12/22/2025 11:28:14 AM EDT
[#2]
Originally Posted By rigger7:
Is this possible with just a barrel and magazine swap?
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@rigger7 No (assuming you're talking full size). The OD on the .40 barrel is larger, and the 9 barrel would need some kind of custom bushing to fit the 40 slide- probably why that conversion barrel (OOS) exists. I've tried it with the 9 barrel, and I wouldn't pull the trigger
It takes away some of the visual impact when you can't see it.

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