Omega1, please do not scrap the rifle off as they are great little things and deserve to be shot as often as possible. I managed to find an extractor for a Mk1 earlier this year so they do exist however they are pricey, from memory the last one was GBP60.00 plus some shipping. If you want to me to try and track down a spare please give me a shout.
(Your 'scope bracket came from us)