Colorado Democrats are calling for a ban on high-capacity ammunition magazines, more background checks for gun purchases and new liability for assault-weapon manufacturers.
Senate President John Morse says inaction on the issue of gun violence would be "completely unacceptable."
One proposal would prohibit the sale and ownership of magazines capable of holding more than 10 rounds. Another bill would require more background checks on firearm purchases to include sales between private owners.
Democrats also want sellers, manufacturers and owners of assault weapons to be held liable for damages caused by the weapons.
Rocky Mountain Gun Owners head Dudley Brown says that would effectively ban the sale of assault weapons.
A spokesman for Democratic Gov. John Hickenlooper said the governor's office plans to "carefully study" Morse's liability proposal and called his idea creative.