Ok Guys SO title says it all, heres the 3 gun glitch.
1. You can do this at any round even from start.
2.Ok so in the 1st room on the very first few rounds i reccomend doing this.
3.u need at least 3 people to do this.

Tutorial
1....ok so 1st off every1 needs 1000 points, then every1 should buy either m14 or olympia, definitively not both at the same time otherwise this glitch wont work!

2....Next you want 2 of you to down yourselves right next to eachother whether its wid nades or a zombie.
Then the guy up has to face one of the players down, then hold x. As you start to revive your team mate, turn and face at your friend next to him whilst keep holding X.

3....Youll notice the revive bar will reset because uve started to revive some1 else.
so wa u wna do is do this process quickly, so start reviving one of them then turn your camera onto your other downed team mate then go back and forth like that but keeping hold of X all times.

4.... You have to do it pretty quickly, so i reccomend you do it at a fast pace for about 5-10 seconds, wen u let go of X, youll realise youll have no gun in your hand, this means it has worked.

5....Now go and buy the other weapon off the wall you dont have whilst you still have no gun, and WALLAH! youll have 3 guns, u can now swap these guns and not lose any. You can do this glitch to all of your friends in the game and if you go down you will still have 3 guns if revived.

6....The only bad thing about this glitch is you cant knife, but a 3rd gun is better than your knife i suppose

Hope this helped guys and happy glitching + rep thanks