Mick,
Thank you very much.
Mark, I spoke to Colin at the weekend, he had a non original piston in there that was longer than standard. Its all sorted now!
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Silly point which I'm saying as a just in case...
If you took the trigger unit out, when you reassembled I assume you put it back in place "cocked"?
(I'm assuming the Rekord trigger assembly is the same as a HW77 here - you need to put engage the sear before reassembling otherwise it doesnt cock).
In cases like this I always try it without the main spring.
Glad you got it sorted.
Founder & ex secretary of Rivington Riflemen.
www.rivington-riflemen.uk