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Alvin, Diamondback says yes it does. Details here : https://diamondbackfirearms.com/shop/db9-6-round-magazine-gen-4-with-finger-extension-2/

Alvin, yes sir. This will fit all db9 models except DB9FS (Full size 9mm). Hope this helps.

Alvin, the DB9 6 round magazine with Finger Extension fits all DB9 models. This magazine is not intended for use in the DB9FS (Full size 9mm) handgun. Have a great day!