http://www.al.com/news/index.ssf/2015/10/bill_would_remove_tax_on_gun_s.html
Last sentence "Also, taxes paid after Oct. 22 will be refunded if the bill becomes law."
Unknown validity of web page
I heard (a rumor) that after a specific date tax stamps will be refunded. This could be totally made up but I read that somewhere.... Ill see if I can find it