From The Federalist:

What’s more, the man accurately references comments Biden made at rally on March 2 while accepting the endorsement of Beto O’Rourke. Biden said, “I’m going to guarantee this is not the last you’ve seen of this guy,” referring to O’Rourke. “You’re going to take care of the gun problem with me. You’re going to be the one who leads this effort.”
How else can one interpret that except as an endorsement of gun confiscation? After all, it was O’Rourke who in a September debate boasted, “Hell, yes, we’re going to take your AR-15, your AK-47.”