Are hand guns or AR-15 rifles used in most mass shootings?

I am going to show what is the correct answer to my poll question on YouTube. I hope everyone comes and finds out the truth about mass shootings in the United States. We will also talk about what the AR stands for in AR-15.

Poll about AR - https://www.youtube.com/channel/UCUAfE1AbiaJbwXgb3mWLtpQ/community?lb=Ugkx-2HBRyCFcyG9tI3wUTi_rwoJt9dlydmS

Does 'AR' in AR-15 Stand for 'Assault Rifle'? - https://www.snopes.com/fact-check/meaning-of-ar-in-ar-15-firearm/

Gun used most in mass shootings poll - https://www.youtube.com/channel/UCUAfE1AbiaJbwXgb3mWLtpQ/community?lb=UgkxqsZCyR0U2BxL__M9S2L-_kQ5w6tG3Lpe

Types of guns used in Mass Public Shootings 1998 through March 2021 - https://crimeresearch.org/2021/04/types-of-guns-used-in-mass-public-shootings-1998-through-march-2021/

Mass killing database: Revealing trends, details and anguish of every US event since 2006 - https://www.usatoday.com/in-depth/graphics/2022/08/18/mass-killings-database-us-events-since-2006/9705311002/

mass shooting - https://www.britannica.com/topic/mass-shooting