No need to worry about it now, Jon, I have a cunning plan.
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After great thought and much measuring, I've decided to graft a HW80 breech and barrel onto my Mercury cylinder.
My thinking behind this is that in order to make a proper job of this Mercury cylinder I'd have to take out the breech plug, build it up with weld, machine it back down and then weld it all back in the cylinder.
Fitting a HW80 breech forks is about the same amount of work but I'd gain a proper breech hinge bolt a proper 5.5 barrel and the ability to fit a decent set of steel open sights if I want to.
All the best Mick