did the same thing a couple years back bud - basically sell everything u can...within reason - rifles are a big no-no - they WILL get confiscated at the border whether shipped or on baggage (even if declared).
vests magazines tactical gear in general are all ok but be prepared to get the spanish inquisition (just in case lol). pretty much everything apart from ur guns themselves are gonna be ok but save urself the hassle and have them mailed to you - don't take them on ur baggage unless u want the "star" treatment at the airport like i got lol
gimmi a PM if u need more info and I can fill u in on it (from bitter experience lol)
"Creator of the Zombat Sniper - oh yeah baby"