It works if you watch not to thin out the chamber wall too much. I would not advise welding a barrel, but in this case I think he will be fine because of the low pressure round. It amazes me how people are scared @#$%less of heating up a bolt to weld a handle on but will break out the welder the minute they have a barrel problem. Welding on a high power barrel will either anneal the barrel or harden it more, but it will not "Do nothing".
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