I tested those gatling guns a bit, does the "Reload Hindering" Effect does not work? I equiped an alt with them in mock battle and had the same reload speed a had before, i tried for a while, took some hits from those, tried from different angles, all i could think off, always had the same reload speed.
The "Melee Battle Hindering" effect from the Flare Guns
Prototype Assault Flare Gun worked fine.