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Romulus, depends on the soft solder. TIX melts at 275 with strength of 4000psi. Brownells Hi-Force 44 flows at 475 for 28,000psi; Brownells Hi Temp Hi Force flows at 650 for 38,000 psi and silver solder flows at 1205. I would use silver solder if I was replacing the sight. To keep from scaling the bore you can immerse everything in water except for the area you are actually heating. George
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