I would like my next build to have a swamped barrel and would appreciate some advice on fixing underlugs, particularly at the thinner section of the barrel. The two methods usually employed each appear to have drawbacks; dovetailing could leave a very thin amount of metal between the grooves and the dovetail; soldering, especially silver soldering, requires heating the barrel to a high temperature locally. I don't know whether heating the barrel does cause a problem but some manufacturers (all?) heat their entire barrels to relieve stress. Could soldering create stress or deformation in the barrel? What worked (and didn't work) for you? Also, how did the early gunsmiths attach these underlugs??