By DESIGN there is not too much that can be done to improve the trigger pull on the S&W Sigma. Through polishing and cutting coils, you might make it somewhat lighter and smoother but it's will never be a crisp target trigger. Unlike the Glock and XD trigger which hold a fully or near fully cocked striker, the S&W Sigma the trigger pull, pulls the striker to full cock before releasing it. Almost everything, except the polishing, will compromise the reliability of the firing system to some degree. Be very careful with stoning the striker engagement since it will double very easily or fail to reset.
If you think of and treat the Sigma as a magazine fed revolver then it's actually quite nice. The Sigma trigger is long and stacks abit at the end. Feels alot like a double-action Colt revolver trigger. Think of it like that and it's not bad. I just wouldn't try and make it something it isn't.
If you think of and treat the Sigma as a magazine fed revolver then it's actually quite nice. The Sigma trigger is long and stacks abit at the end. Feels alot like a double-action Colt revolver trigger. Think of it like that and it's not bad. I just wouldn't try and make it something it isn't.

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