I am new to HK, HK4 and this site. I recently acquired 2 HK4s. One is an early production with the safety completely inside the cut out on the slide. When the safety is on or in the safe position this gun can be cocked and the hammer drops with trigger pull. I understand the hammer does not hit the firing pin. The second HK4 is a later model, one of the 12000 made for the Police but it was exported. It has the safety that extends out over the cut out and when this gun is in safe mode, the hammer cannot be cocked and the trigger cannot be pulled all the way. Is all this normal or is one of the guns malfunctioning? In all cases the gun is empty and the magazine is in the gun. In both cases if the safety is OFF, the gun can be cocked and the trigger pull drops the hammer. Thanks for your help.