I am unable to play the campaign mode of halo 4 o MCC as it does not load or glitches out or the gun and the crosshairs dissappears. I tried to restart the level, it still glitched out and I tried playing the campaign from the start, but after quitting the game and resuming it, it glitches out. I do not want to download the massive update again, please help.
You should report this bug in the dedicated thread. Be more specific and try add more details.
Disinstall and reinstall works quite always, if you don not want to due to connection issues try to be really specific so that someone can help you.
Anyway, have you tried playig another mission ? Maybe starting with the initial cutscene without skipping it.
They fixed it. thank you for replying 
Glad to see you got your issue solved OP, feel free to open another topic if you still need help with anything