You should have the game taken away from you, you do realize that each one of these is looked at and it wastes time just saying

This would take a long time probably and i don't know anyone that shoots from the left hence your aim would be messed up (Put two hands up where you can see them then close your right eye and see the sight shift....

Well why does it not do anything on MP i'm not saying it could be you it could be a weak server

This is most likely a server side issue or bad internet connection check yourself before making more work for developers that don't know how to fix everything.