Put just the poly trigger and Apex USB in my .40c, everything else is factory parts (including trigger spring). Trigger feels slightly lighter before breaking, but have no gauge to verify. It may just be much better finger purchase and feel on the the face of the Apex trigger that gives that impression. I hated the factory hinged trigger, and the Apex poly trigger and USB made for very smooth uptake, and crisp break of the trigger. Well worth the $$$. No problems trusting it for carry purposes.