[Paine in the Neck]

probably stolen and used in some kind of violent crime.

This. You have no idea what trail of police ballistic records this weapon is dragging around in its wake.

[Lurker]

Drop in a new Glock barrel. Problem solved.

[marktwain]

“This. You have no idea what trail of police ballistic records this weapon is dragging around in its wake.”

Not in this case.

Glocks particularily, are so uniform, with polygonal rifling, that it is very difficult to tell the difference between them from ballistic evidence.

http://www.authorstream.com/Presentation/ralugersyadiloh-249004-Forensic-Firearms-Evidence-Basic-Design-Nomenclature-Operation-firear-Education-ppt-powerpoint/

Six-Groove Polygonal Rifling Profile:
Six-Groove Polygonal Rifling Profile melcon s. lapina

Slide82:
Presently (1991) it is used in the Austrian Glock pistols in 9mm, 40 S&W, 10mm Automatic and .45 ACP. Some semiautomatic pistols made by the Heckler & Koch firm of Germany also use this type of rifling with 4 grooves and a right twist whereas the Glock guns have used 6 groove/right twist configurations to date. The interior surfaces of these barrels are very smooth and therefore the markings they impart on fired bullets are very fine. This has often made the process of identifying bullets fired from such guns quite difficult.