Yes, I see that listed in the article you linked to, Eberly, but when I go to her campaign website, which is the link the article supplies to verify the information it provides, I don't see anything about "mandatory buybacks for assualt-style weapons." I see banning of assault weapons going forward, but maybe I'm missing something and you can find it. Here's what I found:
Make Our Communities Safer From Gun Violence and Crime
As a prosecutor, Vice President Harris fought violent crime by getting illegal guns and violent criminals off California streets. During her time as District Attorney, she raised conviction rates for violent offenders " including gang members, gun felons, and domestic abusers. As Attorney General, Vice President Harris built on this record, removing over 12,000 illegal guns from the streets of California and prosecuting some of the toughest transnational criminal organizations in the world.
In the White House, Vice President Harris helped deliver the largest investment in public safety ever, investing $15 billion in supporting local law enforcement and community safety programs across 1,000 cities, towns, and counties. President Biden and Vice President Harris encouraged bipartisan cooperation to pass the first major gun safety law in nearly 30 years, which included record funding to hire and train over 14,000 mental health professionals for our schools. As head of the first-ever White House Office of Gun Violence Prevention, she spearheaded policies to expand background checks and close the gun show loophole. Under her and President Biden's leadership, violent crime is at a 50-year low, with the largest single-year drop in murders ever.
As President, she won't stop fighting so that Americans have the freedom to live safe from gun violence in our schools, communities, and places of worship. She'll ban assault weapons and high-capacity magazines, require universal background checks, and support red flag laws that keep guns out of the hands of dangerous people. She will also continue to invest in funding law enforcement, including the hiring and training of officers and people to support them, and will build upon proven gun violence prevention programs that have helped reduce violent crime throughout the country.