Bit of a long shot,but try Tim Landers [Landers leisure]down in Tralee.He is out of the gun busisness as a dealer,but might be able to help in a private capacity?Or advise further.He did a pretty good job of tightning up my old poachers 410 a few years ago in the stock and action.

Maurice gearon in south tipp is very good with anything to do with gun repairs or fitting / adjusting stocks. I think Irish shooting sports have a lad who does it too for them

Small arms services in cork might be worth shot