Surrey Police officers were at a property on Stafford Road in Caterham following an incident earlier this morning, Saturday October 6.
At around 12:30am officers attended an address to carry out enquiries linked with a separate altercation in Caterham on Friday evening.
Upon entering one part of the property officers discovered suspected controlled drugs and a number of suspected firearms. A man in his 30s has been arrested on drugs supply and firearms offences.
Surrey Police says there is no wider risk to the public.
Caterham Rail Station and part of Stafford Road were closed while officers where working with the occupants but have since reopened.