Anyone know if Walther treats their barrels with the tennifer process the same as Glock does. The reason I am asking is my 9mm P99 barrel has marks on the rifling that look like deposits but aren't as no amount of scrubbing with a brass bore brush will remove. I remember that some of my Glock pistol barrels have the same type of marks and was told that this is the tennifer finish that is wearing off and that it is typically gone after about 1,000 rounds are fired. Got 400 through the P99 so I will be watching.