The most powerful pieces of a Democratic gun control package could be on the way to the governor. The ammunition bill would limit most magazines to 15 rounds. The background-check bill expands the requirement to private and online gun sales.
So far, only New York has approved statewide gun controls in the wake of last year's mass shootings. Federal gun restrictions are pending in Congress.
Both chambers of Colorado's Democratic Legislature have approved the bills but in slightly different versions. They must pass both chambers in identical form before they become law.
If the House takes the procedural vote Wednesday, it sends the measures to Democratic Gov. John Hickenlooper, who has said he'd sign both.