Review (5/5): Also fits the Glock 26
This is incredibly easy to install (you install it as if it were the barrel). You can see the safety barrel from the ejection port side, as well as the front. It sticks out about 1/2" from the barrel hole of the Glock 26, which means you can see it from any angle except directly behind it. It should be noted that you can work the action, activate/deactivate the slide stop, and pull the trigger with this safety barrel installed. Rounds will not cycle when the safely barrel is installed (obviously), but you can put a full magazine in. Great product. It's as close to 100% safety as you can get when training.