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Define 'silver solder' !! There is 'soft solder' which is a 95Sn5Ag solder which melts at about 400 F and there is a 'hard silver solder ' which melts at 1100 F or more . the hard solder should be called a' braze'.
The soft solder may not have the strength but shouldn't cause other problems. The hard solder has the strength but the heat applied may damage the barrel from warping.
Welding ,TIG, and taking care to keep the barrel cool would probably be the best choice but knowing the barrel's alloy would be important.
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