I dry fired mine a lot without the mag in it too before I found out there was a mag disconnect, then I stopped, but I was having occasional misfires so I removed the disconnect plunger, now it never has a problem, but I am by no means advising you to remove your disconnect, and if you want it taken out PLEASE take it to a gunsmith then put several hundred rounds through it to make sure its safe, as I have done with mine. As for cocking the hammer on a live round, the pistol has a trigger safety that blocks the firing pin if the trigger isn't pressed back completely so as long as your finger is off the trigger it shouldn't go off, but still be careful when you cock it. And PLEASE don't carry it cocked with the safety half on.....PLEASE! The trasition from DA to SA isn't that hard to get used to. And if your worried about the firing pin, take it to a smith, but I doubt its broken, there a rattle in mine and I've checked my firing pin and its still in one piece, but again, if you have any doubts take it to a smith.