More than a dozen guns were lost or stolen in West Mercia last year, new figures show.
The Gun Control Network said the figures, which show hundreds of guns are lost and stolen nationally each year, are "appalling" and criticised owners who lose their weapons.
The Home Office said the UK has some of the toughest gun laws in the world and that enforcement agencies "will work quickly to crack down on criminals who illegally obtain firearms".
Its figures show 17 guns were lost or stolen in West Mercia in the year to March – up from six the year before.
Of them, two were stolen and 15 were lost.
Some 14 of these were shotguns, while one was a rifle.
Across England and Wales, 439 firearms and shotguns were reported lost or stolen in the year to March, a 20% rise from 365 the previous year – of these, 165 were lost and 274 were stolen, both increases from the year before.
While shotguns and rifles accounted for the majority of lost or stolen guns, other types reported missing included handguns, pistols and sound moderators.
Gun owners are required by law to report a lost or stolen weapon within seven days of the incident.
The National Crime Agency said gun crime in the UK continues to be relatively low compared to mainland Europe but recognised "some criminals may try to obtain firearms illegally through theft from lawful licence holders".
A Gun Control Network spokesperson said: "Anybody who loses a weapon is not fit to own a weapon.
"They are actually in breach of the technical requirements of the licence, that it must be kept safe and secure at all times."
A Home Office spokesperson added that the police have powers to revoke a firearm certificate if the holder does not store their weapon securely.
The number of people seeing their licences revoked has also increased across England and Wales.
Last year, 385 firearms licences were removed from owners, a 26% increase from the 306 the year prior, while a further 1,075 shotgun licences were revoked, up by 9% from 982.
Among them were 58 firearm and shotgun licences revoked in West Mercia.
Overall, 864 applications for a firearm or shotgun licence from people living in the area were accepted – down from 1,094 in 2020-21.
It means 27,217 people are now authorised to use guns in the area – of these, 109 are aged 17 and under.
Christian Ashwell, head of firearms threat at the NCA, said: "The NCA works closely with policing partners and engages directly with representatives of the firearms trade and sports shooting associations to promote the safe and responsible ownership and storage of firearms, shotguns and ammunition."
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here