A 10" .22 lr barrel that I picked up for next to nothing. Basically I bought a 14" 445 Supermag barrel with a 2-6x Redfield scope and 10" .22 lr barrel for 150 bucks a while back.
I sold both and kept the scope. I don't really miss the 445 as the round is a bit odd and I have the 45-70 that outperforms it, but the 10" 22lr was nice to carry.