The right type of radiusing done before the tubes are tinned and pressed into the breech will hide the joint line. Proper radiusing means undercutting the face, so that when the tubes are pressed together the undercu lips rise up, leaving a swarf that is then struck up.

Even though I have been reassured that welding is safe, the thought of a weld a few inches from my face, over the most stressed part of a the barrel kind of unnerves me.