Forgive me if I am a little confused as according to "Skennerton" The Lee Enfield , it would seem to indicate that the Envoy, Enforcer, L39 & L42 rifles were all fitted with the Monte Carlo stock as standard and I have found no mention of the standard No4 butt being used on any of these rifles
If you look at the manual and master parrts list for the L39 (and L42) you will see that the butt is a standard No4, and it was only issued with the 'N' length butt.
Would you like a copy of the illustrated parts lists ?
Mine are not the best, but they are not too bad. I can think of lots of Enfields I'd rather have but instead of constantly striving for more, sometimes it's good to be satisfied with what one has...