A new tax on gun sales in Cook County takes effect Monday.
$25 will now be added to every gun sale in the county.
That tax is aimed at curbing taxpayer expenses linked to gun violence, including health care for gunshot victims and jail, and court costs for criminals.
A group of firearms dealers and gun owners have filed a lawsuit to stop the collection of the tax.
They say it violates their constitutional rights to keep and bear arms.
The county expects the new tax to generate an additional $600,000 this year.