Devongunsmith Diaries #2 John MacNab 20 Bore Shotgun Rush Repair

HAVE I TAKEN ON TOO MUCH?
Unavoidably, so close the Christmas holidays, and the Boxing Day shoot, the inevitable rush repair.. suspected light strike, or misfire, an intermittent fault, plus the cartridge manufacturer has some differences in their old and new cartridge stock... far too many variables.. Will my gamble to take this gun on for a rapid repair prove to be too much to take on?
Errata in the video: MacNab Highlanders were made by Batista Rizzini. The MacNab Lowlanders were made by Sabatti

The Devongunsmith Diaries concept was conceived by me during lock down, and the premise was to be able to perform work without a fully set up gunsmiths workshop, but rather, using just the Cottage Kitchen Table, a few hand tools, some cordless tools, a table vice, and other small DIY tools.
While the channel is not specifically intended to be a how to guide, it is mainly for entertainment.
While in the UK gunsmithing must be performed by the Licenced Gun Trade, Rumble is without borders, and if the channel is useful to someone as either entertainment, or indeed helps you to decide if a repair might be possible, then I have been a help to you.

As an Amazon Associate, I earn a small commission from qualifying purchases, this helps to support the Devongunsmith Channel, The following are products I use regularly.
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Bisley do a smaller pack of Moly: https://amzn.to/45xNZqe
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Solvent Contact Cleaner, to use to clean the metal parts: https://amzn.to/3ZQW0FG
Browning Legia Gun Oil Spray: https://amzn.to/46qSUuB
Cold Blue Gel G96 which I use for touch ups: https://amzn.to/46PoykX
Cold Blue liquid smaller Bottle, which I use for complete bluing: https://amzn.to/3rLF4nt