Talk:Dex Dakra/@comment-208.54.44.211-20150313003144/@comment-194.138.39.61-20150323151758

http://www.reddit.com/r/Warframe/comments/2yunr8/psa_warframe_anniversary_gifts_323_to_41/

Somewhere there it is quoted that you will NOT get another Dex Furis if you already have one. So you have to sell your Dex Furis before the giveaway and then you will get a new, unranked one with another free slot.

So you can decide if you want a free slot for the cost of having to level the weapon to 30 again.