I've been landed with this rifle from a friend. He has asked if I can sort it but I can't find it listed anywhere in the usual spares suppliers. Can anyone tell me if parts from the later guns will fit?

Or has anyone got a usable one or similar for sale?

Or has anyone got any suitable bits?

I don't like to see any gun unusable but I'm loathed to try anything radicle if I've nothing to replay it with.

Many thanks, Rob