More than 30 police officers, including firearms specialists and a helicopter, have taken part in raids near Bristol to recover ammunition.
Addresses in Stock Lane, Langford, and Middleway Lane, Dundry, were targeted during the operation on Friday morning.
A man, 58, in Langford and three men aged 26, 61 and 76 from Dundry were arrested and are being held in connection with firearms offences.
All four remain in custody while police enquiries continue.
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