big gun AmE informal
top gun AmE informal

And I'll make up for my age with a really big gun.

He tried to bring the big gun up with one hand.

We could hear the big guns some ten minutes to the south.

The big guns had stopped now and they could hear again.

And he knew just where to find the big guns.

And I didn't want to bring out my big guns until the very end.

So, what happened to the big guns from the West?

If neither of those return, then some big guns will go out.

He had wanted to be the one to shoot the big gun.

He headed for a door, a big gun in his right hand.