This seems true for the mini-guns on both sides while in First Person View. However from 3rd person view (exterior view) both guns function as expected.

I've found a video demonstrating this bug

http://www.youtube.com/watch?v=mnfIA0O4epA

This issue was processed by our team and will be looked into. We thank you for your feedback.

Please keep the issue monitored to see when it is fixed.

Has anything been done with issue. It is still very present!

You don't understand, it's future technology/it's an alpha/it's not CoD :D:P
Awesome bug & good find.

Should be ok in following updates...

Mass closing resolved issues not updated since November.