Hello fellow hunters. Here you have 2 articles related to gun regulations in order to bring your gun to Spain. Caza Hispanica blog post
Hunting documents and gun permit for Spain Caza Hispanica, airport gun assistance, blog post
Complete Spanish airport gun assistance
Hope it comes in handy to more than one.
Please let me know if you have any questions, doubts or if you are having a hard time getting everything you need.
Safe hunting, my friends!