Lee Enfield No 1. Barrel

[BVZ24]

Leaning back towards original 303. I mocked up a 10 rd mini 30 based magazine, and although it seems plausible, it's going to have feed issues. The 5 rd mini 30 magazine is much easier.

I suppose I should ask, what forms of carbine could have been converted from Metford Mk 2 actions?
If I go carbine route, I'd like to make a facsimile of either a cavalry or NZ carbine, because I'm not likely to find either of those any time soon.
What are the changes in the carbine rear sight, and does anyone have basic dimensions of the carbine front sight?