Board Thread:General Nerf discussion/@comment-29341333-20160811175224/@comment-3362895-20160826013413

http://www.orangemodworks.com/product_p/spg-u5x3.htm

Not only does such a thing exist, and in 3-packs, but I recommend that a RoughCut spring be used in the Mega BigShock instead of the OMW-recommended BigShock upgrade spring.