Special police forces temporarily arrested a 36-year-old rocker during a raid against organized drug crime in Düsseldorf.
A pistol, large-caliber shotgun ammunition and 250 grams of marijuana had been seized, the police said.
Five apartments were searched in the state capital.
The background to the measures is the suspicion of drug trafficking.
Düsseldorf - He is directed against a total of four accused.
The 36-year-old main accused was released after the measures were completed.
According to investigators, he is said to be a member of the rocker group Hells Angels.
dpa