What does this mean?

[Tennessee Dave]

Here's a picture of my Trojan barrel flats and the area under the fore end. I see some fine linier marks if that's what they were talking about. What does the
HT/A mean?

IMG_2064.jpg

IMG_2065.jpg

[edgarspencer]

Look at the breech face of the barrels Craig posted in post #4 of this thread. That is what Josh was talking about.
It is generally accepted that HT over A signifies Heat Treated- Annealed.