Improving Sigma accuracy

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NOT "shooter error"

Guys, this 53-year-old has been shooting everything since the age of 5...my first firearm was a birthday present on my 5th birthday, a Remington Boys' Model .22 single-shot bolt action in .22 Long.
My Dad was an Air Policeman, and a crack shot (and still is), who was my primary firearms instructor.
I have fired all manner of pistols for many thousands of rounds; wheelguns, semi-autos, DAO, DA/SA, SA revolvers and DA/SA revolvers.
I know how to aim a pistol.
My Sigma has shot consistently low and left since I took it out of the box 6 years ago. I loathed the excessively long and heavy trigger pull, and naturally assumed that the trigger pull was contributing to my problem--often, by the time the trigger lets off and the round is sent DR, my hand would be quivering slightly, so it is a natural--but has proven to be an ERRONEOUS--assumption.
I recently performed the trigger pull and polishing mod on my Sigma.
WOW, what a difference! Pull seems to be about a half to a third of previous, feels slick as glass, causes no quivers, and I can now do something that was patently impossible before: rapid-fire. Guess what? Gun STILL shoots low and left. I can hammer 25-foot 7-shot groups into a 2.25 area time after time in rapid-fire. STILL low and left. Taking my time and firing slow does nothing to improve target strike area--aim at the center, hit 1" low and 2.5" left. Aim 1" high and 2.5" right, and the bullets punch the center ring EVERY TIME.
It's NOT the shooter, and I've seen SO many of the same complaint that it is naive or presumptive for someone to say "It's you."
It ain't me. The rear sight can be drifted left to improve the windage strike, but the front blade cannot be altered. I like the 3-dot sights, but I wish there were an adjustable (for both windage and elevation) rear sight I could replace the factory rear with. I'm not concerned about it affecting concealability; it's a full-size gun that cannot be easily concealed anyway. It is my home defense pistol and I'd rather know the bullet will go where aimed without employing Kentucky windage.
 
This thread was started 3 years ago.
Just an update, the Sigma went down the gun trade trail and I've never been so happy to see a firearm go. I bought a Sig Sauer SP2022 and now when I aim at something, I generally hit it. :)
 
My son had the same issues with his Sigma 40. He traded it in and got an M & P 40 and life is good. There is a reason the Sigma is cheap. S & W knew what their product was worth and sold it at a reduced price!:evil:
 
The first and last Sigma I shot was owned by a co-worker and had a 15 pound 3 ounce trigger pull (Verified by Lyman digital trigger pull gauge). He sold it and bought a 1911.

Just my .02,
LeonCarr
 
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