Comparing the trigger action of new 640-1 Pro Series to my model 40. The model 40 trigger resets with 2 audible clicks, the second producing the most movement of the cylinder stop. The 640-1 has 3 audible clicks, the second producing the most movement of the cylinder stop. If I cycle the trigger to cylinder lock but no hammer fall both only click twice on reset. When I hold the 640 up to my forehead with the barrel pointing to my left and the cylinder centered on my nose I hear the first 2 clicks in my left ear and the third in my right. I think it may be the DA sear in the hammer resetting. Need to know if this is normal to the 640-1 as 40+ years of firing the model 40 has me conditioned to feeling and hearing 2 clicks and a few times during fast dry fire practice I haven't let the trigger fully reset.