They are technically single action due to how the stock trigger system works, but called a double for the same reason... Makes sense?

Basically in stock form the gun feels like a double but really acts like a single.

The reason is what happens during trigger pull. The trigger feels like a double, you get a nice long long pull and stack up of trigger force before release which is similar to a double action . This happens because as you squeeze the trigger the sear is rotating and pushing the striker pin back before it is released leading to a stack up.

But it really is single... You have no ability to decock the striker and even if you some how managed that squeezing the trigger does not reengage the striker for firing.

So why called a DAO? So it appeals to LE and because it feels like it...

An APEX DCAEK kit replaces the sear so that you eliminate that stack up during trigger pull and just get a clean break like a SA with a nice light 5lbs or so trigger force while still being good for a carry application. APEX also offers trigger kits that reduce the trigger stroke before and after break to make it feel ever more like a SA.

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