How The Tank Fires His Product Grenades

It came to me today for some reason. The assault throws his bombs and the sniper tosses his flak but the tank has a pro pipe built into his armor that shoots his product grenades.

So how does he trigger it? Telepathy? Pretty boring. Clenches his butt cheeks? Disgusting and I think I'm referencing a cartoon. His beard pushes down on a button? Probably the best bet.

What do you think?

I think he presses the X button.

Non-silly response: It's fired out that cannon fixed to his right shoulder.

He is asking HOW the tank triggers it.
He presses LB. Sorry, tactical.

Magic?

Oh, well then he obviously triggers it by using a roto rooter.

Probably has a switch in his glove. I mean, something funny.

Beard.

He has an assassin hiding inside his armor in a appealing position, but when he needs to shoot the nade, he ask her to do it. Probably my touching some button.

Its a wrist position, much like Spiderman.

He lights his farts afire. The tube extends down his back to a pilot light. When he wants to fire his product grenade he squeezes out a fart which in turn ignites the pilot light causing a small explosion which through very efficient engineering causes enough pressure to shoot out the grenade. Right?

I want to know where he REALLY fires his railgun shots from. You need to get right near the edge of platform for your shot to go over the edge. I think maybe he fire out his... you know...

He poops it out.

Like an egg.

This.

Not this.