Very easy to do, just follow these steps;

1: Click on Perks when you get into the party/game lobby
2: Select Sharpshooter
3: Laugh
4: Click on Perks again
5: Select anything other than Sharpshooter

Alternatively;

1: Take a wooden toothpick bought from any pharmaceutical store near to you or any store for that matter
2: Apply the toothpick securely underneath a toenail of your choosing
3: At as much force as you can muster, kick a solid, hard object with the foot that has one of the toes with a toothpick underneath the toenail

This is a very concise and accurate representation of the enjoyment, expertise and team-cohesion of having a Sharpshooter in your team/being a Sharpshooter!

Hope this helps!