I also have a problem with the Safety Action tab on my Glock 17, Gen 4. If you have bigger hands, or longer fingers, you probably do not have the problem that I do. Sometimes the tab sticks out further from its slot than at other times. When it is sticking too far and I try to place my finger on the trigger, I end up pushing the tab just enough sideways, causing it to hang up or bind, preventing me from pulling the trigger, unless I readjust the position of my finger. If the tab is not sticking out like this, I can easily pull the trigger without being hampered.