Not so much the half-cock. I was looking at a CZ-75 D PCR Compact at a gun shop recently, and as soon as you begin to thumb the hammer back the safety stop engages and prevents the hammer from coming back to a full down position. Now on the HK USP's, you don't have a safety stop on the hammer. If you take a USP and thumb the hammer back and then let go before it locks, it will go to the full hammer down position.