There is currently a thread with someone who has no avatar just like you, who is asking the same thing. Try looking around and reading the rules befpore posting, you will see there are a couple of threads on this subject but most of the gun glitches are complicated or have little proof.

It's really hard to explain but here I go. Go on solo and start out. Wen u get more then 3100 keep a zombie at the end of the round. Now u open all the doors on the side by the carbine. Turn the electricety on and go back up and cross the bridge by doubletap the open the door to the teleporter and link it to the mainframe then go back to the teleporter and when the zombies in the double tap room throw a grenade and kill him. Then run into the teleporter and go way into the end when you see a crack, crouch and instant roundes!!! My gamertag is bragly message me if u have any questions dog rounds take 3 minutes so don't worry hope I helped.

I asked for the multiple gun glitch not instant rounds.

Granty wrote It's really hard to explain but here I go. Go on solo and start out. Wen u get more then 3100 keep a zombie at the end of the round. Now u open all the doors on the side by the carbine. Turn the electricety on and go back up and cross the bridge by doubletap the open the door to the teleporter and link it to the mainframe then go back to the teleporter and when the zombies in the double tap room throw a grenade and kill him. Then run into the teleporter and go way into the end when you see a crack, crouch and instant roundes!!! My gamertag is bragly message me if u have any questions dog rounds take 3 minutes so don't worry hope I helped.

last time i checked that glitch doesn't give you an extra gun..
the easiest gun glitch that i know of is the revive one. search thru the forums for it

OOps wrong answer sorry but u can still have insta rounds now I got 255

Granty wrote It's really hard to explain but here I go. Go on solo and start out. Wen u get more then 3100 keep a zombie at the end of the round. Now u open all the doors on the side by the carbine. Turn the electricety on and go back up and cross the bridge by doubletap the open the door to the teleporter and link it to the mainframe then go back to the teleporter and when the zombies in the double tap room throw a grenade and kill him. Then run into the teleporter and go way into the end when you see a crack, crouch and instant roundes!!! My gamertag is bragly message me if u have any questions dog rounds take 3 minutes so don't worry hope I helped.

You lost me at It's really hard to explain.

If I need to run around the map with my controller in one hand while saying the alphabet to my mic when nude just for a 2% chance at a 3rd gun, I don't want to try.

That wasn't the gun glitch assholecocksucker that was a instant round glitch ****

Granty wrote That wasn't the gun glitch assholecocksucker that was a instant round glitch *****

First off chill, I was joking.

Second, he wasn't asking for the glitch that im sure you copied from the sticky.

HEY calm down dude he was just making a joke that you reply d to the wrong question. but thank you for the confusing instant rounds glitch