Check CharacterController's Velocity

I know, it's been asked before and it'll be asked again.

But by god, I've searched everywhere and I still have absolutely no idea on how to implement this.

Basically, I want to make a gun play an animation when the character moves horizontally and is on the ground, et cetera. The problem is, however, I don't know the actual velocity of the CharacterController (standard one).

Anyone got a solution (without adding a rigidbody)?