KeyCode RT Xbox

Well,

I know that question is not uncommon at all. But it really bothers me still...

I kinda know how to activate the RT and LT in the Input-Settings of Unity, but i still dont know the buttons name as a KeyCode.

For Example:

if (Input.GetKeyDown(KeyCode.Joystick1Button5)) theGun.isFiring = true;

So, how to write that Code for my Right Trigger and not the Right Bumper ?

Thanks everybody