That's a model change.
Getting it done means cutting through the finish and into the metal, which means getting the gun refinished. (If your gun is polycoated, it can't easily be fixed, and if its High Gloss Blue, the slide will have to be reblued.)
Front serrations look nice, but they are more cosmetic than functional: if you want to confirm whether there's a round in the gun, you can 1) use the loaded chamber indicator, or 2) you can do a "press check."
Either way, it can be done without using front serrations.
(That said, I also don't want to do anything that puts my hand near the front of a loaded gun when my other hand is near the trigger, too.)