MKI and MKII wood

[Alan de Enfield]

Sorry to butt in ... Can one use MkII wood on a Mk I receiver?

Only if you can splice in the wood needed to fill the gap across the rear of the forend, and, if you can locate a "tie strap & brass rivet".
You'll also need to shape / cut out the wood where the tie strap goes.

Unless you are an acomplished woodworker I'd say "NO".

Easy to go from a Mk1 to a Mk2 but not the other way around.