Alg-trigger-kp9

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.

If you find the trigger for a defensive firearm, you can install the included auxiliary spring to increase the pull weight by about 0.5–1 lb, making it more predictable. alg-trigger-kp9

Some users report constant light primer strikes. This is often solved by ensuring the main spring is properly seated or using the high-tension auxiliary spring provided by ALG. The most famous part of the story

Pull weight often drops from a factory ~5 lbs to a crisp 2–2.5 lbs . Some users report constant light primer strikes

A common "scary" moment for new installers is when the bolt carrier doesn't slide back in easily. This usually happens because the ALG hammer has a different profile than the factory one and requires a firm push or slight polishing to smooth out the travel. ⚡ Performance Gains

Installing an ALG AKT trigger in a KP-9 is rarely a "drop-in" experience without minor fitting.