Need help with Marcus super sweep mission.

[Demon619]

I need to find some players that have not done the Super-Marcus Sweep mission after completeing the main story line of the DLC,

After making my way to the armory, killing Knoxx again, and heading into the armory, I did the glitch that let you have unlimited time in the armory. But when I collected enough guns, the middle objective went off, and so when I killed myself to re-enter the armory, the main door was closed.

so I need anyone who has not done any of this mission so I can continue on and get this achevement for doing every mission in the DLC .

I'm online right now so reply if you can.

[Mr Blonde 324]

i might be wrong but try reloading the game and see if knoxx reappears. kill him and maybe that door will be open again

[Demon619]

nope still closed, but if I'm on someone elses game and they still need to do all this mission, it will open and I can complete it.