I no longer have my Sigma, But I have a couple parts left.
1-NEW Extractor for SW9VE(May fit other models) New part, never installed. Purchased from Numrich
1-NEW Trigger spring for Sigma pistols. New part, never installed.
Both parts for $10/shipped. Paypal payment.
To the OP:
Have you corrected this issue yet?
Mine has the same issue in the same spot. Sometimes when you close the slide slowly, it is sluggish before it locks up. I don't think this will cause any actual issues when firing. I will put another 100 rounds through it this weekend.
Anyone...
I no longer own any .40 pistols, but when I did. My favorite round was:
Winchester Ranger T-Series 165 gr.
I have tested these through numerous guns. They expand pretty nasty also :D