Thanks to MrRampageHD for showing me this. As you will see from the vid all you do is go to the top of the stairs and aim your crosshairs in the corner and down yourself.
Then revive yourself like in the video and your done.

Ways to exploits this:
First if your not very good getting points early or just lazy you can have a guy go in this glitch until you and your team have enough points.
When you have enough to get what you want then player in the glitch will have to die out at the end of a round so he can respwan in the next one.
Players not in the glitch can hold up in the corners where I go in the video. (Best to have the shower entrance and the one above glitch )

Another way is to play and once you or all your team has all the weapons they want upgraded, have one player preferably the host or player with white name to go into the glitch.
From there the rest is up to you on how far you want to go. You can get more players in the glitch but remember, the only way out is death which is the only downside to this glitch.

If you like this glitch then dont forget to like the video or subscribe, thanks. Also I will leave a link to MrRampageHDs channel, check it out.