In the fifth hearing on Tuesday at a court in Munich, Schultze claimed two suspected NSU members now deceased had wanted him to provide a gun, and he admitted to having bought the murder weapon and handed it over to another suspect and former member of the organization, Ralf Wohlleben.
Pointing out that he never thought that they would misuse the gun, Schultze said he got in touch with the organization in 1997.
The NSU is charged with the murders of eight Turks, a Greek man and a policewoman between 2000 and 2006.
The NSU cell remained undetected until Beate Zschäpe, the prime suspect, gave herself up in November 2011, after police discovered the bodies of two of her alleged accomplices.
Uwe Mundlos, 38, and Uwe Boenhardt, 34, allegedly shot themselves after a failed bank robbery.
After their deaths, the gun used in the murders of the 10 people was discovered.
