SOR 556 Visual Recoil Bug

When equipping the SU-230 LPVO to the SOR 556 MK2 and using the 1x magnification mode, the visual recoil appears to be unnaturally harsh on every 3rd round fired.

When using the 4x magnification mode however this bug does not occur. 

I have tested the SU-230 LPVO on other weapons in both 1x and 4x modes to see if this issue is present on those but it seems only the SOR 556 is affected.