Additionally, while the Firearms Act 1968 allows antique firearms to be possessed without a certificate as a "curiosity or ornament", the changes to the law in 2014 now means that if you are prohibited from possessing firearms, you will be unable to possess antique weapons.
Both the regional weapons and national firearms surrender will end at 11.59pm on Sunday, November 26.
Officers, who are hoping for a similar success this year, say some people may hold firearms in innocence or ignorance of their illegality; or they may have older items in their homes which have been overlooked or forgotten. However others are acquired and distributed by criminal networks to threaten or harm their local communities.
It's part of a National Firearms Surrender, giving members of the community an opportunity to safely and anonymously dispose of firearms and ammunition.
It is part of a national campaign aiming to reduce the number of illegally held firearms within our communities.
"The message is clear - if you have even a shadow of doubt about the legality of a weapon or ammunition you possess we urge you to hand it in during the surrender".
These included hand guns, rifles, shotguns, antique (obsolete calibre) guns and imitation firearms, as well as ammunition.
Assistant Chief Constable Helen McMillan said police were "realistic" they were "not going to get hardened gang members" surrendering their arms or even those women and teenagers who were sometimes ordered to hide the weapons on behalf of the gangs.
"We want as many guns surrendered as possible and I would encourage the public to come forward in this manner".
Paul Gibbins, the Metropolitan Police's forensic firearms manager, said he feared criminals would resort to new technology to get their hands on weapons.
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".
That's why we're offering people this opportunity to safely hand in their unwanted weapons which, if in the wrong hands, could be deadly. "The sooner you hand them in over the next fortnight, the better".
Anyone with information about gun crime including possession of illegal firearms and ammunition is asked to contact police on 101.
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.
"This is a surrender and not an amnesty so whilst people will not be prosecuted for the possession of the firearm, our specialist officers will be examining the previous use of the firearm".
"The fight against gun crime is stronger than ever, and we are working with partners and our local communities to safeguard, educate and intervene at the earliest opportunity. We take all reports of incidents involving firearms extremely seriously and robust action will be taken against anyone who commits a firearms related offence".
When and where can I hand in firearms?
Firearms and ammunition must not be left outside any police building if it is closed, nor handed in before or after the surrender period. A list of designated stations in West Sussex and their opening times can be found below.