Glock 80%

Polymer 80

Anything you can do to have a Glock 19 in your arsenal is a great idea.  It is always a functional component of a survival/self defense/combat tool kit. 

As a military sidearm it is perfectly suited to act as a backup to a long gun. 

As a self defense gun it requires less training than most to get functionally proficient though it has a safety concern that must be addressed regarding good training to avoid accidental/negligent discharges.

As a survival tool it is unsurpassed in functional reliability availability of parts.