I have a NZicon marked Patt 14 (F) rifle I am restoring and somewhere in its post army life someone has silver soldered a brass plate to the mid section of the barrel (it was sporterised when I got it). I have the woodwork and metalwork to bring it all back to military configuration, but am having a job trying to remove the silver solder now I have taken off the brass plate to allow me to fit the full length stock I have for it.

Should I be able to remove all traces of the stuff with heat, flux and solder wick or is going to require some sort of mechanical intervention to remove it? I have manage to remove all but a light coating of it, but the remnants ain't budging.
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