Glocks are the Toyota Corolla of handguns. They are the preferred weapon of police departments and federal agencies the world over.

They, and many modern firearms, use a rotary hammer forged barrel with polygonal rifling that does not leave unique markings like traditional cut rifling.

Also, forensic ballistics are mostly bunk, like forensic bite marks.

https://www.scientificamerican.com/article/the-field-of-firearms-forensics-is-flawed/

Bullet and rifling forensics is not based on science

A barrel is a barrel, and I think it highly unlikely that a mass-produced product leaving a unique fingerprint on something that's been smushed into a completely different shape can be used as forensic evidence. Unless you know of it being scientifically proven, it is the domain of TV CSI.