The Johnson is one of the could have been guns.
I’ve looked at it and thought the same thing, but maybe in a different way.
The Johnson rifle is very MODULAR rifle. The magazine for example, can be swapped out easily. Pull two pins and you can take it off and replace it with a box magazine well.
Change to the 7.61x51? Press a bullet tip the barrel catch and you can pull the 30-06 barrel and put 7.62x51 barrel on.
Select fire? Trigger group.
Synthetic stock? Pistol grip stock? It should only take a minute.
So I’ve wondered before if we had the Johnson in service at the end of WWII, could it have become the M-14?
Another change that could’ve come: That receiver and what they call the “radiator” is all one piece. The bolt does not lock into that. It locks into the barrel extension, as on the AR10/15. So that big hunk of steel could easily be aluminum and trim a lot of weight.
Lots to “What if?” about.
I’ll take some pictures later.