Help with barrel markings?

[Gerald Coffee]

Thanks a lot. Now if we can just determine the other codes.

[edgarspencer]

HT over A is generally accepted as Heat Treated and Annealed, though 'annealed' may be a misnomer. Alloy steel would normally get a stress relieve cycle after Normalizing (same temps, different cooling rate.)
It's also been speculated that it means 'High Tensile Alloy'. Either would fit I suppose.