Around the mag wells of my four Enfield #4s, the metal shape of the thin frame corresponds exactly with the contour of the wood.
On both of my authentic #5s (one is from Joe Salter), the metal contour does not have the same exact shape/contour as the wood.
I don't know whether my LE #4/#5 book by Charles Stratton mentions this.
It is kind of subtle, and you wouldn't normally compare this area.
Tiki: Have you or any other guys noticed the two different contours?
TX Hunter: Without the lightening cuts, your action might be a bit stronger than with original #5s.