I had a Gibbs #7 JC a few years back. Its an Ishapour #1 mk3 in 7.62x51 nato. I really hate to say it but the only mount that works - that I am aware of is a B-Square but I think there may be another one. Thats what I had on mine. It seemed to hold zero well and the rifle was really accurate. Do a Google on Enfield #1 Mk 3 scope mounts. If you find one and mount it - Lok-tite the hell out of the mount screws. Luck to ya.