I don't think it looks bad, I just think Nerf can be spending their money on a new gun or something. But yet they continue wasting their money on something as stupid as a different color shell.
This is a nice mod. I have done this before and tried with that spring and the original but found that the original spring had better ranges. I think I had the same amount of material at the back of the plunger tube though so I'm probably wrong.
Also just a suggestion to everyone who doesn't have access to this spring can just use the original bbb spring and about 2 inches of 3/4 in pvc with just a little bit of duck tape wrapped around it and it works almost as good.