A friend of mine bought one. He knows very little about these guns.
Can anyone fill in?
The barrel is bored out and sleeved with a brass .25 tube.
There is some work done to the stock, but not sure whether by Harper or some Don Robinson type (there is a heart - yes a heart - inset into the RHS of the stock on the other side of the cheekpiece)
It's not a particularly attractive gun.