Adding an additional .02
"First, allow me to thank you for posting this. I am a huge Sig fan, and own a P239 in .357 Sig (of course)."
I have friends (officers all) who own, shoot, and love their SIGs. I can't. The triggers always feel clunky, overtravel is prevalent in those I've fired, and even with the DAK, the pull is going through an arc that requires more training than is common in departments.
"I can't speak to all the technical issues, but I enjoy the "decocker" function because it allow me to safely lower the hammer after racking the slide to chamber the first round. Also, the hammer on my Sig DOES NOT have to be "down" to fire; once can cock the hammer and fire, or simply pull the trigger, just like a revolver. All Sigs, as far as I know, are DAO."
Standard (non-DAK, non-DAO) SIGs are Double Single action like their Beretta bretheren. I've carried a 1911 and never decock the device. Going from tactical carry to administrative doesn't involve lowering the hammer neither does going from admin back to tac carry. I'd recommend ISMI Silicon Carbide springs as they are VERY much less prone to take a set and deliver strong consistent throw throughout their life.
"The hammer never should be in a cocked position, right?
One of the reasons I don't CCW a 1911 is for this very reason: most of the folks I know who carry one for personal protection leave the hammer cocked at all times, with the main safety engaged (there is, of course a secondary grip safety), but I've never been comfortable with it. Heck, I know one fella who doesn't even engage the main safety, but counts on the grip safety alone while carrying his 1911 (this I definitely wouldn't recommend). Probably more a matter of psychology than safety, but I've just never been comfortable with single-action "cocked and locked" for routine carry."
I wouldn't recommend the grip safety only carry, but with the primary safety, the grip safety, and in the case of the series 80, the firing pin block, the pistol is mechanically well safed. This of course in light of Cooper's second and a half rule, "...place guarded trust in mechanical safeties." Frankly the main safety we all need is an alert and contientious mind (fortunately this is the case in nearly all the serious gunfolk I've encountered).
Outside of a shallower departmental training curve, the best reason I can see for the double action trigger is that second strike on a hard primer. Although, I can't recall when I've had that problem in anything but a reload, and then, seldom.
"Just my $0.02."
Up to .04,
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No one we have known, would EVER carry a weaopon with a round in the shute and have the hammer cocked. No purpose and recipe for no purpose. You may want to re-visit the discussion with your acquaintances.
(shaking head - dizzy)