I know, it sounds like a back-handed brag. but last year we had all those and gave away at least that much. But I think I should have held the tree back more than I did. The main tree is a Liberty, and Alan aptly describes Liberty as a “fruit machine”. Plus the Karmijn was really exuberant this year. Surprised me how much it gave.
I don’t know the rootstock. I bought it 20+ years ago from a local nursery before I was aware of much of those things. It was sold as a “semi dwarf” and when I contacted them later to ask they couldn’t tell me. But it has been easy to keep to a mid-sized tree, and I have had no problems with it that weren’t my own fault. I’ve been told it could be MM 106 or maybe M7, probably not big enough for M2. And that’s all I know about that!