In this tutorial I will be telling you how to max out your secondary guns without even using them. This is a really simple glitch however it is very effective for leveling up your guns and your rank.

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Instructions
1. Create a class with a gun that is one kill away from 500 kills. For the secondary gun, choose one that you want to max the gun out to.

2. Remember how many more kills you need and go into a public game.

3. Once in a public game, find an enemy and shoot him down. As soon as you have killed him, take out your secondary weapon.

4. About 20,000xp+ should pop up on your screen if you done it correctly.

5. If it doesn't say that your secondary didn't level up and it's still the same, then open up the xbox guide button and go to the dashboard.

6. Once at the dashboard, have another go at the glitch and you should get it sooner or later.

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This really isn't a difficult glitch to do and it is definitely helps if you're struggling to level up.