Talk:Weapons/@comment-119.139.196.5-20131228064606/@comment-6417460-20131228220809

Well, even if you don't sell it, it's the same as if you had sold it and lost your slot. The weapon is occupying a slot after all.

I can't say for sure whetever you'll lose your slot or not, but I don't think so. You're selling your weapon, not your slot.

Here's also a thread about the same question : http://warframe.wikia.com/wiki/Thread:263523, but there aren't any guarantees in the answers.