I have carried a Smith & Wesson 642-1 (pocket carry) daily for a couple of years now, but I recently took a job that is more carry-friendly and I am looking to start carrying a little larger pistol IWB soon. I am a big fan of SIG pistols (see my user ID), but I also own GLOCK and Smith & Wesson M&Ps. I understand the logic behind the argument for an identical trigger pull for each shot that the GLOCK and M&P provide, but I wonder just how important it is in real-world circumstances. If I buy another SIG to carry, it will be DA/SA as I've owned their DAK and DAO triggers and don't like either option. Also, I realize that trigger time on whatever I choose is required for me to be accurate.
Having said all of that, my question is: In a real-world self-defense situation, with all that that entails (adrenaline rush, loss of fine motor skills, etc.), is the transition from a DA to SA trigger pull (even for those that don't practice it regularly) a liability? I recall reading somewhere that in many cases a person who actually ends up firing their weapon does so without remembering much about the actual shooting, including number of shots, etc. Are there any studies that indicate whether or not a DA to SA transition is less desirable than a GLOCK-type constant trigger pull when it really counts? Any information you folks can provide will be greatly appreciated.