A loose rib at the muzzle is easier to fit than a loose rib elsewhere, such as in the middle of a rib, or back against the Forend loop.
That is because you can get under the rib from the front well to clean out under there. It is not a bad idea to maybe heat up and unstick the rib a little more behind the loose area so that you know you are cleaning out the section that was loose. Any old dirt, oil or crud must be reoved as well as much of the old solder as you can on both the rib and barrel to make sure a good repair is had.
And a little tip about soldering. Be careful with the flux. If you flux only where you want solder, then the solder will only stick there. If done right, cleanup of solder afterwards will be minimal. Rib cracks filled with tons solder of solder and tons of scraping and cleanup is a sign of too much flux being used.
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B. Dudley
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Threaded Mode