Thanks Charlie, got the Carbine Collector‘s Club now!
And now, of course, I‘m wondering whether my carbine came from the same source as Patrick Duis‘ example.
Anyway, I just made up enough ammo to be able to try it out again.
BTW, a couple of years ago (i.e. pre-Covid) I had the recoil plate perfectly set up so that the barrel floated about 1/8“ high in the channel before tightening the band. When I reassembled it with the bayonet band this float had disappeared. The recoil plate screw was not completely loose, but by no means tight. So I tightened it up to what I felt was a wood-compressing - but not wood-crushing - torque (i.e. remaining within elastic limits) and - hey presto! - the 1/8“ float was back again.
It obviously needs some kind of fixing. I don‘t want to have to re-torque it before every competition. I‘m thinking of a dab of contact adhesive over the end of the screw and the inset nut. Any other suggestions?
Patrick