Original location: How to change the scale of a weapon in GUTS
I know this subject has come up a few times over the years. Not sure I have seen a GUTS solution before so here it is. This solution does not change the actual mesh file, I believe you would need 3D software for that. It just creates a .layout file that will override the mesh file of the weapon.
Steps to increase the scale of a specific weapon in GUTS
Screen shot of re-sized weapon done in this manner