John-Charles, Among the key features found on the Smith & Wesson SD9 and SD40 is the new Self Defense Trigger™ (SDT). Providing a smooth, consistent trigger pull from the first round to the last, the SDT design not only improves accuracy but also provides users with a heightened sense of confidence during the most stressful situations. Trigger pull is a heavy 8 lbs. Have a great day!

John, it is about 8lbs with constant tension throughout the pull range. It is supposed to mimic a double action trigger pull for safety against accidental discharges. Cheers and stay safe!