To add to what David is saying: I would tin the surfaces first, it seems to help the solder "find its way" to the right place. You flux the surface, then heat it and apply the solder, once it's good and runny you wipe it with a rag, Q-tips or whatever works to get the excess off. This will leave a very thin coat of solder on the surfaces. Slip the barrel band on and put it in a padded vise, with the muzzle up. Apply a little bit of flux, reheat and apply a tiny amount of solder. If everything works as intended, the solder will wick into the seam and fill it completely. It takes a minimal amount to fill the seam, so the thinner diameter solder David is talking about should work well to minimize the amount you add.
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