My opinion
I had a Sigma!
Sold it quick, after my sending it back to S&W and it was creating 15-20 inch patterns.
I got it fairly new, I knew the guy who bought it and about approx. how much he shot it. He wasn't underage but still lived with his dad who was 'anti-gun' and got caught with it and his sks.
My brother bought both for $250.00! Steal!
Sadly, no!
The Sigma was the .40 version.
It would shoot alright but then it started shooting really horribly one day.
I thought I was just flinching since the .40 was just so much louder than my brother's glock17. And it was about the 2nd time we had gone out to shoot it since getting it.
But he tried it as well, and he could not hit paper at 10 yards. I tried again and asked him to tell me where the bullets were going. Might have been 7 yards, either way the bullets were almost hitting the cement that housed the would frame for the backboard for the targets.
I tilted the gun up higher into the air to hit the board but stopped that when I thought people were thinking I was shooting into the air
Slightly exaggerating, but after this I got it sent out to S&W; they stood by their product and repaired it but after going back to Ben Avery here in Arizona the gun had improved; I could hit paper but the pattern was still not acceptable since it shot a horrible over 12" pattern.
/did try different ammo, and repeat trips to the desert and range to test it before sending it off.
My .357 magnum with full 200 grain corbon rounds gave me a 5-9 inch pattern at 7-10yards with a 2 1/8" barrel! (Single shot, on double action who knows where my bullets went!).
Damn I love that gun, but hate full .357 loads, I can get a very good pattern with .38 special at 10 yds. /anything below 8"; not great but I'm a lazy shooter; I quit caring after getting the first bullet in the middle
With his glock I almost looked like a 3-5" pattern until I got lazy.
Not much of a range person, I prefer to go out into the desert and shoot rocks for some reason
/one of these days the rock will shoot back no doubt!