Guns and ammunition, including replica firearms, BB guns and antique weapons, can be surrendered at designated police stations during the surrender.
McMillan said those handing firearms in will not be prosecuted for possessing a weapon at the point of its surrender.
"The more firearms and ammunition out of harm's way helps us keep our communities safe, avoids the risk of them getting into the wrong hands and the possibility of them being used in crime".
Any guns which can be proved to be linked to a crime will be kept as evidence and retained for any future court case proceedings.
However, these can still be lethal if they get into the wrong hands and members of the public are urged to take this opportunity to dispose of any firearms or ammunition they may have, regardless of how old they might be. So, removing weapons, even if they're not used, off the street, out of the lofts, into a safe place into a safe place is in everybody's interest.
"Handing in these potentially fatal weapons is an important step and I would urge residents to make the right decision and hand over any illegal firearms they are in possession of".
In Caerphilly County Borough, firearms and ammunition can be handed in at police stations in Blackwood (open daily between 8am and 8pm), Caerphilly town (between Monday and Friday 9am to 5pm), and Ystrad Mynach (Monday to Friday 8am to 4pm). Furthermore there may be people who, because of the change in legislation around possessing a firearm, now own a weapon they can not legally hold. "You don't have to give your name or address, we just want more guns out of harm's way".
"This surrender gives people an opportunity to safely and anonymously dispose of firearms and ammunition in a safe environment." .
"This is an opportunity to surrender firearms and not be charged with illegal possession".
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She added: "While crimes involving firearms in the Thames Valley region are rare, we know that every firearm poses a potential threat if they are not licensed and stored safely".
Latest crime figures issued last month by the Office for National Statistics show that crime involving firearms in England and Wales had increased by 27% between July 2016 and June 2017.
During the last national firearms surrender in 2014 more than 6,000 items were handed in to police.
The surrender runs until November 26 and is part of national initiative run by the National Ballistics Intelligence Service (NABIS). "This way you can be confident you have got rid of a firearm safely".
And Clive Grunshaw, Lancashire's Police and Crime Commissioner, added: "I fully support Lancashire Constabulary in their campaign to remove unsafe firearms from our streets".
Illegal possession of a firearm can mean five years behind bars and if you are found guilty of possession with intent to supply that can lead to a life sentence.
If you know of people involved in illegal firearms you can call Crimestoppers on 0800 555 111; report it online at Lancashire.police.uk/report it; or call 101.
Anyone needing advice on how best to transport the weapon or ammunition to their nearest police station should ring the force on 101.