This is a Sargent & Greenleaf 833 Military Padlock with six pin Medeco Biaxial core. It was sent to me by Raymond of Lockpicking101. It had no keys so it was picked blind. He wanted to see if I could get it open so he could fit it with a core that has keys. Great fun to pick. Six pin Medeco Biaxial core, two mushroom pins in chambers one and two, the rest were stainless steel anti-drill pins. They key pins were non-ARX, full slot pins. Thanks to Raymond for sending me the lock and giving me the opportunity to pick this bad boy. Thanks to you all for watching.