This is just from the board where ppl create and publish their computer designs, nothing to do with real upgrades/changes.
I like them all with the exception of the svt.47, the Enfield versions are my favourites. Cool concept designs.
I actually kinda like the look of the SVT-47, but wonder what kind of problems you'd run into with that full length rain and the top eject of the original.
You'd have to rework the ejection system to not end up with a lot of stovepipes.