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You would need to edit the gunspec.txt file for that weapon. They can be found in the Gamecore/guns/The folder of the weapon chosen.
Look for these statements in the weapons file.
recoily = 20 ;recoil vertical disturbance
recoilyreturn = 95 ;recoil vertical return percentage
recoilx = 3 ;recoil horizontal disturbance
recoilxreturn = 90 ;recoil horizontal return percentage
zoomrecoily = 15 ;recoil vertical disturbance while aiming
zoomrecoilyreturn = 97 ;recoil vertical return percentage while aiming
zoomrecoilx = 2 ;recoil horizontal disturbance while aiming
zoomrecoilxreturn = 94 ;recoil horizontal return percentage while aiming
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