At first sight the rearsight with its inserted notch element looks a good deal higher than the original.

Presumably this is because the original big bullet rocked the piece back in early recoil as it ambled up the bore, making it necessary to angle the boreline downwards for normal aim - so the nearly-recoilless CO2 version has to bring the boreline up to compensate, and the only way to do that without making the foresight unrealistically low was to up the rearsight?

These look fun. Do you have to be a re-enactor or a registered collector or a member of some secret society or other to buy one?

Regards,
MikB