Trigger fix for Sigmas
I too own a Sigma 40, and have been frustrated by the heavy trigger pull. After reading various ways to fix it on multiple sites, I finally came upon a cure I can live with.
I didn't like the idea of removing both springs entirely, and removing the stiff outer spring and leaving the flexible inner spring doesn't work since the small spring is too flexible and comes out on its own. My thought process led me to finding a softer outer spring. Being impetuous and not willing to wait, I began looking around my home for something to replace the outer spring. What I discovered was the spring on a common retractable BALL POINT PEN was the exact same diameter as the stiff outer spring on the Sigma, but a whole lot softer !!! After determining that the pen spring was a little too long, I trimmed off about 1/4" to match the length of the inner spring. Before I re-assembled the sear , I did a little polishing on the metal parts to eliminate that gritty feel. Yesterday (Memorial Day) I went to my gun club range and fired off a 100 rounds. The Sigma performed flawlessly and with about half of the former trigger pull. I disassembled it while cleaning just to be sure nothing went wrong, and both springs stayed locked into the detent on the sear as intended. I'm not a gunsmith, but I think I've found the solution to this nagging problem at no cost !
