Wiktionary
hardballer
n. (context informal English) One who exhibits hardball (tough or ruthless) behaviour.
Usage examples of "hardballer".
Loud, but not as loud as the Hardballer would be once he had it pointed at Chili Palmer.
Catlett raised the Hardballer to put it on the shape, got it almost aimed and a scream came at him out of the dark—a scream that filled the house and was all over him and he started firing before he was ready, firing as that scream kept screaming, firing at that shape dropping flat on the stairs, firing till that fucking scream turned him around without thinking and he ran down a hall to the back of the house and got out of there.
Time to bring out the Hardballer and he did, putting it on Chili Palmer standing in the middle of the deck.