Pull weight often drops from a factory ~5 lbs to a crisp 2–2.5 lbs .
The most famous part of the story. Most KP-9 users must install the included roll pin into the trigger tail and file it down until the safety can just barely engage. alg-trigger-kp9
It is widely considered the best upgrade for competitive shooting or rapid-fire "mag dumps" due to its hair-trigger nature. ⚠️ Known Plot Twists (Troubleshooting) Pull weight often drops from a factory ~5
You often need to squeeze the trigger while rotating the safety lever back into position during the initial install. alg-trigger-kp9