Pretty sure it was to protect the +2 baseplate as the 19X comes with a 19 round magazine.
There are some agencies that do not authorize the +2 baseplates as they can be torqued off if gripped too hard.
Note the Glock 26 has a similar lip (likely for use with the 12 round magazine).
"When the phone rang, Parker was in the garage, killing a man."
“Remember, being healthy is basically just dying as slowly as possible,” Ricky Gervais
Just got back to this. And thank you for the concern, no offense taken. In an era of constant outrage porn I always try to shrug things off and often things are not meant to offend. 4 or 5 formal shooting classes from national instructors, but nothing very heavy on injured shooter instruction, but yes, in range days. I would love to take a class with Petty. I'm not really hating, and that's why I kind of prefaced this is more for people who had buyer's remorse for a variety of reasons. Most of my main points beyond that have already been stated. Thank you for the discussion and no further derailment should occur on my part.