Holdout weapons

Holdout weapons is a term used to describe weapons which can be brought into certain "weapon-free" areas — primarily the three Strip casinos (Gomorrah, The Tops, and Ultra-Luxe)— without being taken from the player. The weapons that can be brought in all depends on the players sneak skill.

List of Holdout Weapons:

Pistols
.357 Magnum Revolver, .44 Magnum Revolver, 10mm Pistol, 9mm Pistol, Lucky, Maria, Mysterious Magnum, Silenced .22 Pistol

Shotguns
Sawed-off Shotgun, Big Boomer

Energy Pistols:
Plasma Pistol, Laser Pistol, Pew Pew

Explosives:
Dynamite, Frag Grenade, Plasma Grenade, Pulse Grenade, C-4 Explosive and Detonator

Melee:
Combat Knife, Chance's Knife, Cleaver, Chopper, Hatchet, Knife, Ripper, Straight razor, Switchblade, Lead Pipe, The Humble Cudgel, Police Baton, Tire Iron, Throwing Knife

Unarmed:
Brass Knuckles, Spiked Knuckles, Love and Hate, Power Fist