Dana White is building a personal weapons room in his Vegas mansion (for real) -- and he hit up the guys from "Pawn Stars" to buy a REAL combat-used samurai sword.
The UFC boss had a hard bargaining sesh with Chumlee and Big Hoss over the blade -- which the guys claim can be traced back to the family of the samurai who used it.
In a matchup of equally intimidating bald dudes, Dana and Rick Harrison negotiated for an entire batch of samurai swords -- bringing his total bill to $69k.