I don't know any specific gun shops since I haven't been there myself. But my wife just visited Ireland and found a book for me that I have enjoyed reading. It is titled "Rough Shooting in Ireland" by Douglas Butler. Published in '06. It is available from
www.merlinunwin.co.ukMy wife told me she found this book in a sporting goods store in either Enis or Galway. She also said there were gun stores/sporting goods stores just about everywhere they went.
I might have to travel over to Ireland with her next time. One of the hosts of a bed & breakfast where they stayed for several days was kind enough to say I could go hunting or fishing with him if I came over with her.
If you enjoy Irish whiskey, I recommend that you try some Green Spot. It is not imported in to the US. Available at the Jameson distillery. My wife was kind enough to bring a bottle back for me. The only problem is that she really likes it too.... Also try Three Swallows, and Fekin. Both are available here, but not as widely as Bushmills or John Jameson. Miele Fait Gailic!!!