Didn't see any "armerias" in that area, but you might try the Really Big City in that area, Salerno. It's less touristy and more workaday and likely to have some retro types,er, I mean hunters. They still had classified phone books when I was there a couple of years ago.
Worth driving up to the top of the Sorrento peninsula where you get away from the spas and cooking schools and touristy stuff and find some old fashioned lodges and "Walton's Mountain" sawmills and dairy farms. And some really rough country hiking. You take the Furore road up from the coast halfway between Positano and Amalfi (I dare ya! Actually it's easier from the Naples side).
Canyon behind Amalfi has some interesting hiking trails too. Bring your oxygen; it's all steps!
Sorry I can't be of specific help, but there are hunters around there (met some), so there has to be a gunshop. Have FUN; drink a limoncelo or so for me!
Last edited by Mike A.; 05/15/15 11:36 PM.