look for any lines that have %obj.client.setControlCameraFOV in any of the gun's "onMount" functions, and delete those lines.
edit:
NVM, all the lines of that function are all cramed together for some reason (saves space i guess, makes stuff hard to read tho), just delete:
%obj.client.setControlCameraFov(%obj.client.defaultZoom);
from this part of all the guns:
function gc_BullpupImageScoped::onUnMount(%this,%obj,%slot) { parent::onUnMount(%this,%obj,%slot); gc_displayAmmo(%this,%obj,%slot,-1); %obj.client.setControlCameraFov(%obj.client.defaultZoom); }