This is a model swap, it just replaces the model that is used in the game with the original model from the 2007 original game. The reason this is a "fix" is because the model they used in Remastered is an unfinished beta version of the weapon with UV Texture mapping issues.
The Alternate SCAR on the other hand is the model that was created by Crytek UK for the 2011 Console Release of Crysis 1, which looks completely different, as you have said. That version replaces the broken model with that one.
Hope that clears it up.
RigPardy
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