The Sigma from S&W is in many ways THE red headed stepchild of the Smith lineup. Created with a price a few hundred dollars below the M&P, it seems to be a popular choice for the budget-minded buyer who still wants the Smith logo. Buyer beware however, the trigger is something out of a horror movie. A Google search of “Smith and Wesson Sigma Trigger” reveals page after page of forum posts and YouTube videos on how to fix things.
Looking at this 7 yard target, you can see how bad it needs trigger work.
The trigger on the stock Sigma goes off somewhere in the neighborhood of 10 pounds or so. Its gritty, nasty, stiff and horrible. The first step toward something better is to remove the double layer of springs in the trigger mechanism itself. Doing this took a few minutes and a sturdy pick. After removing the springs, the pull weight is a manageable 8.25 lbs. which, for most, is a good place to stop. However, this Sigma belongs to my mother in law and an 8+ pound trigger simply will not do.
A swipe of the credit card and $3.39 + shipping got me a Wolff Striker Spring from MidwayUSA. The package is a little light on frills (like instructions), but a simple search of YouTube and a basic understanding of how striker-fired pistols work allowed me to extract the gun’s guts and replace the spring.
An experienced pistolsmith could probably do the job in five minutes. I did it in about twenty including the time needed to freshen my drink. Wise amateurs will do well to use a non-marring tool to remove the delicate plastic piece holding the guts of the striker system in place.
Initial post-op readings on the trigger registered around 7.25 lbs., but repeated dry firing has that number settled in at just under 7 lbs. The trigger has gone from almost unusable to reasonably decent. It’s still not an Apex, but for less than five bucks and a few minutes of your time, you can convert your Sigma into a nice-shooting little polymer pistol.