New 1941 Longbranch No4 MKI and questions

[Enfield trader]

Well it finally arrived his past weekend and I am happy but hve a few questions.

1.Barrel is dated 42 which I guess is ok for a 41 receiver but the rifling is 2 groove, I thought the early No4's were 4,5 or 6 groove.
2. Barrel has a line around it as in it looks like they stopped turing it before it was an even transition - kind of looks like the barrel is two pieces put together.
3. I have the LB micrometer rear sight, Lb early cocking piece and the LB hinged front band - would you put hese on or just leave it as it?

here are some pics

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