Does this exist?

[archer51]

CZ RAMI is close (6.6") although it is thicker that the Bersa. I have carried both and have never had a problem concealing either. RAMI is also availabe in 40 cal at the same size. More firepower at the same size.

[DefensiveCarry.com]

[matiki]

Kahr CW9, just a shade under 6 inches measured at the slide. Six inches measured from front of slide to end of frame

I can't believe I missed that one... I own one and carry it often.

Great gun IMO. P9/K9 should be similar dimensions if you don't want the "budget kahr" (Yes, I know that's an oxymoron).

[TheGreatGonzo]

I have a Bersa Thunder 380 CC. I really like the fact that the first shot can be double action and all subsequent shots are single action and it fits in my pocket. Does anyone make a 9mm with overall length of 6" (or less) that is DA/SA ?

Kahr CW9, just a shade under 6 inches measured at the slide. Six inches measured from front of slide to end of frame

Don't think the Kahr meets the OP's request...DA/SA. The Kahr is DAO.
Gonzo