Yeah it would be legal as any firearm manufactured before 1899 and does not use conventional cased ammunition (rimfire or centrefire) is classed as antique but you can't legally shoot it. I beleive It could even be owned by someone without a firearms licence?
It even allows pistols I think.
See
https://www.firearmssafetyauthority....-be-registered
Scroll to where it says "antiques"
Crazy that any antique trap-door conversions would suddenly require licensing as opposed to their muzzle loading counterparts despite firing the same black powder and same bore diameter projectile.
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