Perhaps you missed this:
'Hell yes, we are going to take your AR-15:' Beto O'Rourke talks guns during Democratic debate (2:17) September 12, 2019
https://abc7.com/politics/hell-yes-we-are-going-to-take-your-ar-15-orourke/5536214/
If you're in a hurry the quote is at 1:33.
"Well, that's just Beto" ?
I don't think so.
On the other hand, I do believe this, because I heard Biden say it:
Joe Biden Says Democrats Created ‘The Most Extensive And Inclusive Voter Fraud Organization’ In American History October 24, 2020
(video)
https://thefederalist.com/2020/10/24/joe-biden-says-democrats-created-the-most-extensive-and-inclusive-voter-fraud-organization-in-american-history/