I got the spring because I wanted to mod the blaster to shoot 4 darts at a time instead of just two. I wasn't able to figure out how to do that but adding the new springs in was quite easy. I get much more distance and power out of the darts. The only drawback is that I can't get the blaster to single fire now with the stronger springs. I didn't have a problem getting it to single fire before. I almost never shoot it that way so it's not a problem for me but worth noting.