You might as well just vendor it. Here is the reasoning:

LESSON 1: Crafting and making a loss *face palm*.

If you crafted from 2* all the way to 5* (not including mats or cr used) and used mist this is how much ce you used plus then unbinding it:

100 + 300 + 700 = 1,100ce (craft on mist so take 100 off)

Then your going to unbind it, again I will presume you use mist:

3,900 + 1,100 = 5,000ce (remember I did not include mats or cr, that will also add to your total loss).

So that's 5,000ce worth of well ce that you used to craft plus unbind. Say if someone decides to buy (note blitz needle can be bought from kozma for 3,500ce or 3,400ce (using 100 mist). So more maths:

5,000ce - 4,000ce (your b/o) = 1,000ce (this is still 100 ce less than what you even used to make the gun to 5*)

So your total loss this point is 100ce + all the cr and mats you used along the way

Current ce/cr rate is what, around 7,300cr per 100ce

LESSON 2: Now lets talk about Vendoring.

Vendoring your 5* gets you 30,000cr

30,000cr / 73 = 410ce

Therefore you actually make more ce, roughly 300ce (depending on the current ce/cr market value).

Class is over for now.