IMPORTANT! What do gunsmiths call these lettered barrel parts?

[PeterPocket]

I'm sending my SD9VE to S&W for R&R of the gun barrel because I observed it to have significant defects that adversely affect the operation of my gun. In order for me to effectively direct the attention of the service reps and gunsmiths to the specific parts of the barrel that I found to be problemati, I need to know what gunsmiths and gun makers call them.

Below is a photo of the back end of the barrel turned upside down to reveal the relevant parts. Each part is lettered from A to F. I will greatly appreciate someone's assistance in helping me name the parts I've labeled by writing their names next to their corresponding letters.

Thank you in advance.

Peter

A. __________________________

B. __________________________

C. __________________________

D. __________________________

E. __________________________

F. __________________________

 

[chief38]

Just send them the above picture with the corresponding letters as you have here and the names won't matter.

 

[tlay]

I agree, the name doesn't matter. Just tell them side A is bad, or side C is worn. They will figure it out.