Dryfiring shouldnt hurt the pistol as long as your not just doing dryfire after dryfire. A couple here and there and when you have to dryfire in order to break it down or if you like to release the striker for storing the pistol while not in use. Im not a fan of the cable locks that come with any gun. I have seen instances where when the lock is closed, you grab the cable loop in one hand and swing the lock into your other hand with a moderate force, letting the lock smack you palm and the lock would come open. When ever I store my GLOCKs, I just ride the slide closed, and dryfire to drop the striker and lock it up in my gun safe. And my carry/night stand guns, my 23 and 27 stay in ready to fire condition all the time, and the only time I dryfire one of them is when I go out for some target practice to make sure I have my trigger feel right on and when ever I take them down for cleaning. And also, between every week or two, I will swap rounds in mags. If you do want to start extended dryfiring for parctice, do like sfguard mentioned above and get yourself a package of snapcaps.