[D. Manley]

FWIW, below is from the GLOCK WEBSITE:

TENIFER
The name GLOCK has become synonymous for progressive material technologies in the world of arms. The Tenifer surface treatment process for barrel and slide has set standards in this regard. The Tenifer process optimizes the molecular structure of the metal surfaces, achieving a degree of hardness which comes close to that of diamond. In addition to extreme scratch resistance, it results in maximum corrosion resistance.

BARREL PROFILE
Solid, cold-hammered barrels with Tenifer surface treatment and rounded (hexagonal or octagonal) interior profiles offer numerous advantages to the user. GLOCK barrels are considerably easier to clean and maintain uniform precision even after a high number of rounds. GLOCK barrels do not have any corners/edges (as in conventional barrel profiles for deposits and enable better ballistic yield.

TEST FIRING
During development every GLOCK pistol is test fired with overcharged ammunition to establish its safety prior to delivery.....