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RIP - In Memoriam
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DAO is a misnomer. DA is by definition the ability to fire the gun by either of two ways, manual cocking or trigger cocking.

The DAO is capable of only one way. It is actually a SA trigger cocker.

I have a "DAO" revolver, S&W M-65 .357 3". It does not have a "Single action" notch on the hammer and can only be fired by trigger cocking.

The Sigma is not DAO. It is almost the same as the Glock in that the striker is preloaded by the movement of the slide. It differs from the Glock in that there is a spring that resists trigger movement giving the feel of a DAO.

The Beretta DAO's have REALLY sweet hammer cocking mechaisms that are the same for each shot.
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