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So the KAC trigger has a long and creepy single stage then? Its not tight and crisp like a normal single stage?
Is anyone following this? Perhaps this is just too damned hard...
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I think you are failing to take into account that the FA single stage trigger pull is designed just for that, full auto fire, not what you are proposing.
A FA trigger is only pulled once per burst and even then it is not as "deliberate" of a pull as would be the case with a SA.
I agree with Kevin that the KAC FA trigger in the best FA trigger out there, in Single (FA) or Two Stage modes.
Have you ever fired a MP5? 10+ lbs and plenty of creep in FA mode. Do you even notice it? I know I don't. Or a M16A2, again 10+ lbs. Or a most extreme case, a MAC? Well, maybe the MAC example is a little too extreme :) but hopefully you get the idea.
If what you are desiring is a crisp single stage pull, you probably will be happier with the AS Trigger.