Needless to say the extra pull is only once, and honestly its probably a good thing because when you feel light pull like that for a distance you know your weapon isn't in DA and you should check yourself before you have a dumbass moment.
IMO the safest way FOR MY PEACE OF MIND to carry a cc firearm is with a DA first round. Revolvers do that automatically for you, unless you are so dumb you cock the hammer, but in pistols you have to actually put a little thought into it.
IMO a DA first round offers you some protection from ad/nd's, it assures you the pistol will not fire unless you are at least 8.8lbs sure you really want it to, and all follow up rounds are SA anyway...
In a crisis, where my old farts heart is pumping away, adrenlin is sky high, and my natural "flee or fight" instinct has already told me "flight" is not an option, then I want a relatively heavy DA first round, which just might, might, keep me from accidently shooting someone by nature of the light trigger pull of sa when it might otherwise be avoided.
I know some folks think just pulling a weapon will not defuse a potential confrontation, but prior to pulling the trigger, it gives the bg's something to ponder.... Some percentage of those guys might indeed reflect that they made a mistake in confronting someone who "surprisingly" wound up being armed. If the mere sight of your weapon doesn't do any good, and reasoning does no good you can always go 8.8lb+
All of my self defense discussion is based around potential confrontations at self defense range. For me that's probably in the 5-7 yard (or closer) range. I think most folks with any experience with firearms can do a pretty good job of simply pulling the firearm, point it at center mass of threat, and pull the trigger/striker until the party is over. A single first DA round won't affect your "grouping" much anyway.
I love my P99's but there's no way I would cc in SA or AS modes.. Too scary. Next to a nice relatively heavy first da round I think keeping your index finger OFF the trigger until you are really gonna need it there is about as good as it gets, safetywise, when you're talking a loaded weapon.
Dissenting opinions welcomed, and cheerfully ignored..
Best Wishes,
J. Pomeroy