The Kneecapper

The Kneecapper is a unique Sawed-Off Shotgun, featuring increased damage and tighter spread.

Location

 * It can be obtained from Ronald Laren from Girdershade.

Obtaining the gun from Ronald Laren

 * Pickpocket his shotgun ammo, shoot him once, holster your weapon and pickpocket The Kneecapper once he turns friendly again. Or leave the area and come back later, once he has unequipped it. If you're lucky you can directly pickpocket it, or after picking his ammo.
 * Like the above tactic states, the best and easiest way (assuming you can pickpocket) to get The Kneecapper is to get behind him, sneak and then save the game. Pickpocket until you successfully take his shotgun ammo, then leave his house, and immediately re-enter it. Then repeat the process, and now you find The Kneecapper on him, instead of being equipped.
 * When talking Ronald into venturing for Quantums on his own (Black Widow Perk required) he usually dies on the way and his corpse can be looted near or in the Nuka-Cola Plant.
 * Attack him with a weak weapon (so that you don't kill him), then shoot the gun from his hands. Put the weapon away and he will stop attacking you, then simply take the gun. If he picks up the gun instead of stopping, keep shooting it out of his hands until it breaks. Take the gun, then leave and stay away for 3 days. He will be friendly again.
 * Using the Mister Sandman perk allows you to kill Ronald while he is sleeping and, Sierra Petrovita doesn't notice he's dead. This method does induce a karma loss as the Mister Sandman perk does affect karma by large amounts.
 * Just hit him with your fists turning him hostile and let your follower kill him.
 * Or, the simplest method, just kill him yourself.(Karma loss)

Behind the scenes

 * The Kneecapper takes its name from the act of "Kneecapping" someone, which is shooting them in the kneecaps to cripple their legs.

Videos
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Костедробитель El tronchapiernas