decocker

Is the decocker the only way to engage the firing pin lock on a PT92? Or is that what the manual safety does as well? Is that ALL that the manual safety does? With all the different safety methods on the gun, I'm trying to think of the best one/combo to use on a regular basis. I'm thinking...

I recently bought a new PT809. I have to say I'm pleased with everything thus far except the decocking lever. it doesn't seem to work. I'm new to guns so maybe I'm just not using it right, but it seems pretty straight forward - just push the lever down. but it doesn't decock the hammer like...