Gardaí in Laois and Offaly are encouraging firearm owners to submit their fully completed licence renewals once the form is received in the post.
Gardaí said that some people have not filled out the new form and have had to surrender their firearms and ammunition because they were unlicensed.
"A firearm without a licence is an illegally held firearm subject to seizure for being unlicensed," gardaí said in a statement.
If an owner no longer wishes to retain firearms or ammunition, they can be surrendered to a local garda station, where they will then be destroyed at no charge.
A certificate obtained through any garda station is required to own a gun.
Any person over 14 years of age can apply for a firearms training certificate.
The training certificate does not entitle the holder to actually own one and the certificate can only apply to a non-restricted firearm.
The person must always be under the supervision of a specified person over 18 years of age who holds a firearm certificate in respect of it.
Gardaí have also outlined correct storage laws for different types of guns:
According to published figures by gardaí, at the end of 2021, a total of 191,598 firearm certificates were active.
That figure does not include applications for renewal which were granted, but not yet paid, or applications that were in progress, but not fully considered.