The Hunger Games star has been vocal about her stance on the hot topic for some time, and in December (15), she helped to front an anti-gun violence public service announcement created by officials at Everytown for Gun Safety.

Now, in a new edition of Lena Dunham's Lenny Letter, the Oscar winner is rallying support from other concerned citizens, urging them to do their part to tighten gun laws and create a safer future for the next generation of Americans.

"A majority of us are on the same side, so why does our country have a gun murder rate 25 times that of other developed countries?" Moore questioned.

She goes on to reveal she was driven to take action after the tragedy of the Sandy Hook Elementary School massacre in Connecticut in 2012, when 20 children and six adults were slaughtered by a lone gunman.

Moore recalls being on a film set with her then-10-year-old daughter, Liv, when the killings hit the headlines, and she did everything she could to shield her child from the news coverage, asking the cast and crew to switch off their TV monitors.

"I knew I wouldn't be able to keep the news from my daughter forever, but I didn't want her to hear it accidentally," the 55-year-old wrote.

However, little Liv soon found out via social media, and asked, "Mommy, did a bunch of little kids get shot today?"

"At that moment, it felt ridiculous to me, and irresponsible as a parent and as a citizen, that I was not doing something to prevent gun violence," Moore explained. "Simply keeping the news away from my child was putting my head in the sand. I wasn't helping her, or anyone else, by doing that."

Moore has since researched gun violence and she offers up some of the scary statistics for Lenny newsletter readers: "An average of 91 people a day are killed by gun violence," she stated as one example. "That includes children killed by random bullets, mass shootings at workplaces and universities, intimate-partner homicides, and suicides."

And the actress insists gun control legislation shouldn't be a political debate among U.S. lawmakers.

"Where guns are concerned, it is not a good-guy-versus-bad-guy argument," she argued. "It should not be a partisan argument. It should not be a pro-gun-versus-anti-gun argument. It is not an argument about our Constitution. The Second Amendment protects the right of a United States citizen to bear arms. But a gun is a machine. And if you choose to bear arms, you have a responsibility to bear them safely."