January Jones believes America would benefit from a weapons law overhaul.
Adam Lanza, 20, terminally shot 20 children and six adults at Sandy Hook Elementary School in Newtown, Connecticut last month.
January was horrified by the massacre.
The 35-year-old actress, who is mother to two-year-old son Xander, is in favour of new firearm legislation that would prevent this bloody event from occurring in the future.
"I certainly don't feel machines of war need to be in our homes or available to us," she told USA Today.
"I definitely feel we need new laws and new rules for that."
January plays a gunslinging former prostitute living in the brutal plains of New Mexico in the 1800s in violent western Sweetwater, which debuts at the Sundance Film Festival.
The star thinks blaming movies for promoting brutality is myopic.
"I am [able to tell it's entertainment], but other people are not. And that's the conflict," January mused.
"It's something we have to change in media and films maybe. It's a tough one for me to answer since I'm promoting a film where I [commit gun violence]. I don't know. I cannot judge my character's actions.
"Very brutal things were happening [when my character Sarah was alive]. It was a very lawless time."
January always wants to challenge herself artistically.
She is elated to have portrayed such a dynamic persona in Sweetwater.
"I want to be given the opportunity to do lots of different things," January said.
"[Hollywood] can be a town where I feel people have very little imagination."
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