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Klein's Glove (DLC), Dr Mobius' Glove (DLC).
Saturnite Fist Super-Heated (DLC): None. Power Fist: Greased Lightning (DLC), Salt-Upon-Wounds' Power Fist (DLC). Mantis Gauntlet: Embrace Of The Mantis King! (DLC). Fist of Rawr/ Fist of North Rawr (DLC): None. Dog Tag Fist: Recompense Of The Fallen. Ballistic Fist: Two-Step Goodbye (DLC). Protonic Inversal Throwing Axe (DLC): None. Additional Unique Blunt Melee: X-2 Antenna (DLC). Machete: Broad Machete (DLC), Liberator. Grenade Rifle: *Great Bear Grenade Rifle (DLC), Mercenary's Grenade Rifle (DLC/Preorder), Red Victory Grenade Rifle (DLC), Thump-Thump. Tesla Cannon: Elijah's Jury-Rigged Cannon (DLC), Tesla-Beaton Prototype. Plasma Caster: They Smitty Special (DLC). Plasma Rifle: Van Graff Plasma Rifle, Q-35 Matter Modulator. Laser Rifle: AER14 Laser Rifle, Van Graff Laser Rifle. LAER (DLC): Elijah's Advanced LAER (DLC). Additional Unique Energy Pistols: Alien Blaster, Euclid's C-Finder. Sonic Emitter - Robo-Scorpion (DLC): None. Sonic Emitter - Revelation (DLC): None. Sonic Emitter - Opera Singer (DLC): None. Sonic Emitter - Gabriel's Bark (DLC):** None. Laser Pistol: Compliance Regulator (DLC), Missing Laser Pistol. Shoulder Mounted Machine Gun (DLC): None. Caravan Shotgun: Sturdy Caravan Shotgun (DLC/Preorder). 9mm Sub Machine Gun: Vance's 9mm Sub Machine Gun. 12.7mm Sub Machine Gun: Mysterious Magnum. 10mm Sub Machine Gun: Sleepytime (DLC). Sniper Rifle: Gobi Campaign Scout Rifle, **Christine's CoS Silencer Rifle (DLC)*. Service Rifle: Survivalist's Rifle (DLC). 10mm Pistol: Weathered 10mm Pistol (DLC/Preorder). 45 Auto Pistol (DLC): A Light Shining In Darkness (DLC). 357 Magnum Revolver: Lucky, Police Pistol (DLC). Note that some weapons are DLC exclusive, with at least one exclusive to pre-order. There are a couple of weapons that have more than one unique counterpart, and there are several weapons that have none. Below is a list of all the weapons and their unique counterparts, taken from the Fallout: New Vegas Weapons entry on the Fallout Wiki.