My Kimber fired twice with one pull

[dfletcher]

I'd try a new sear spring.

That would be my 1st fix. Bend the left finger (the one with the little hook on it) of the leaf spring forward a bit - put a touch more pressure on the sear, cause it to pivot/press tight against the sear notch in the hammer and prevent it from slipping. So long as the notch & sear are proper I should think this would be the fix.

[AAShooter]

If it is relatively new and has the original barrel, I would would check if for loose breach. If it has loose breach and you are sending it to Kimber, have them fix it while it is in there.

[FCinCA]

Well, it turned out to be my thumb safety. I installed a low mount safety and that was the curprit. I thought the installation was pretty straight forward but that's what I get for assuming. I put the factory ambi setup back and no more issues.