No, no, NO! Mullin did not vote Yea for the National Defense Authorization Act, HR 4350. He voted Nay. I verified this from the link in your post.On HR1620, Bice, Cole, and Mullin voted Yea. Hern and Lucas voted Nay.
https://clerk.house.gov/Votes/202186
On HR4350, the last vote on it went the SAME WAY: Bice, Cole, and Mullin voted Yea. Hern and Lucas voted Nay.
https://clerk.house.gov/Votes/2021293?BillNum=HR4350
These are facts which cannot be denied. Bice, Cole, and Mullin all voted consciously for Red Flag laws. Hern and Lucas did not.
For HR 1620, the following Oklahoma representatives voted Yea: Bice, Cole, and Mullin.
For HR 4350, the following Oklahoma representatives voted Yea: Bice, Cole, and Lucas.