Police forces are appealing for people to hand in unwanted guns with a national two week surrender of firearms and ammunition, starting on Monday 13 November 2017.
Those surrendering firearms will not face prosecution and can remain anonymous.
Gloucestershire, Wiltshire and Avon and Somerset's forces are all taking part in the campaign.
Surrendering unwanted, unlicensed weapons avoids the risk of them becoming involved in criminality and means that members of the community can dispose of firearms in a safe place.
This is a national firearms surrender, not a firearms amnesty, which means that people can hand in guns they should not have without being prosecuted for firearms possession.