[bdhill1979]

I have three HK USP variants, all in .40 S&W

They DO NOT go off unintentionally

The safety lever not only blocks the trigger from being pulled, it also blocks the hammer from striking the firing pin.

In DA mode the pull on the trigger is 14 pounds (i think) to cock the hammer then release. You have to pull for what feels like a mile. DA mode WILL NOT cock the hammer if the safety is engaged. You can manually cock the hammer with your thumb, but then you are in SA mode.

In SA mode you have to have the safety off, the hammer cocked, and the trigger pulled to fire a round. Trigger pull in SA mode is around 6 pounds.

You have to try really hard to fire a round with this pistol.