I see the first link Drew provided shows the "invisible" TIG welded method of sleeving. Most of those I have seen are more attractive than those with a solder joint, or worse yet, chicken tracks covering up the solder joint.

Does anyone know how or if the heat of welding affects the metallurgy of the barrels so close to the chambers, or if any kind of annealing is done afterward?

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug