Armed officers carried out a warrant in Ellindon, Bretton, at about 4pm on Monday afternoon where they discovered the weapon, along with class A drugs.
Two men aged 20 and 58 were arrested on suspicion of possession of a firearm, along with a 49-year-old woman and a 15-year-old boy.
The 20-year-old man was also arrested on suspicion of possession with intent to supply class A drugs.
Information about drug dealing can be found on the force website here, https://www.cambs.police.uk/report/Report, along with the option to report information.
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Police retrieved a sawn-off shot gun in the operation at Ellindon in Peterborough. Photo: Midlands
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Police made four arrests after raiding a property in Ellindon, Bretton. Photo: Midlands
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Police officers at Ellindon, North Bretton on Monday afternoon (February 22). Photo: Midlands
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Police officers in the process of carrying out the investigation at Ellindon, North Bretton. Photo: Midlands