Enfield firing pin, firing pin spring compatibility SMLE vs No. 4 & other questions

[Steve762]

Question #1:
Are SMLE and No. 4 firing pins and firing pin springs compatible between models?

Question #2:
Are major part groups of the SMLE compatible between the various nations of mfg?

Question #3:
Are major part groups of the No. 4 compatible by Mk between the various nations of mfgr?

Thx, Steve

Information

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[Mk VII]

1. Springs, yes, firing pins no.
2. Yes, generally.
3. Yes.

[5thBatt]

You can use a No1 firing pin in a No4 & vice versa but as the threads on the firing pins are different between a No1 & No4 you need to use a No1 cocking piece with a No1 pin & a No4 cocking piece with a No4 pin.
They are interchangable but only as a unit.