A Denver councilman has proposed a ban on bump stocks – the device used by the Las Vegas shooter in October to increase his weapons’ rate of fire.

The legislation proposed by Denver Councilman Rafael Espinoza would amend the city’s existing ordinance banning assault weapons to make it illegal to sell, carry, store or otherwise possess a bump stock. The bill will go before Denver’s Safety, Housing, Education and Homelessness Committee on Wednesday. If approved, it will move on to the full City Council.

Bump stocks replace an assault rifle’s standard stock and frees the weapon to slide back and forth rapidly, channeling the energy from the weapon’s recoil. That allows for more rapid fire, nearly that of a fully automatic weapon.

The device came under the critical eye of congressional lawmakers after its use in the Las Vegas massacre – the deadliest mass shooting in modern U.S. history – though the push to ban the device has slowed as of late.

The legislation notes the use of bump stocks during the Las Vegas mass shooting and how “the city could be susceptible to the dangers of bump stock firing mechanisms.”

In an interview with the Denver Post, Espinoza said: “I’m under no illusion that if somebody is hell-bent on committing a heinous crime, they could both have larger magazines and modify their weapon. But that said, the only people in the city and county of Denver that should have that kind of firepower are law enforcement and trained officials.”

Per the bill, Espinoza defines a bump stock as “any device for a pistol, rifle, or shotgun that increases the rate of fire achievable with such weapon by using energy from the recoil of the weapon to generate a reciprocating action that facilitates repeated activation of the trigger.”

The penalty for violating the measure could carry up to 180 days in jail and $999 in fines.