Well I am Glad some one reads the Manual! I own 6 of these Bad Boys and I have NEVER read the manual But after you posted this I broke out one of my 6 manuals and low and behold you are right! It is there in Black and White! Under Loading and Firing #4. After firing the last round the slide will remain open. Remove the empty Magazine from the weapon by pushing the Magazine catch (19). Insert a New Magazine and then push the slide stop lever (27) downward (See photo 2), or pull the slide slightly backwards and allow it to spring forward. The weapon is now again ready to fire. I guess we can now dispense with the "I do what Glock says to do with their guns..The lever is called a slide lock in Glock's case and not a Slide release lever. The manual says to pull the slide back and release to chamber a round." Not to pick on you Yogi this has been a common theme since I joined here with people incorrectly stating what the Manual says. And Me being a Knucklehead and not actually reading the Manual I was never in a position to refute it. I know it will eventually wear out the slide stop lever but in my 1991 G21 (My Second most shot Glock) or my 1997 G30 (My Most Shot Glock) They still work fine and they have thousands and thousands of rounds through them! Not to mention Probably twice as many dry firings that I used the SSL to release the slide. Yes I keep an eye on it (I posted about a month ago a pic of what they looked like in another thread where I was chastised about not following Glocks instructions). So lessons learned by me is to 1. Read All Manuals 2. Don't trust info you get on the internet! 3. Read All Instruction Manuals.I can see how it can wear out eventually. However, I purchased a Gen 3 g26 about a month ago and in the manual it even says that you can either pull the slide back to release OR press the slide stop down to release the slide.
Just some food for thought.