Original design by Scrutmonkey. I had some 6mm carbon tube lying around and thought that carbon tubes on my Nerf would look cool. Note that these are ends for the push arms only. You will still need the barrel and pump grip from the original creators. I remixed the arm ends to accommodate the carbon tubes, mostly for the geometry of how it connects to the pump grip, as the rear connector and arm length are perfect from the original. Might also work on a retaliator but that would need different length arms and I don't have one to test.
You will need:
2 M4 8mm Bolts
2 original flat screws that attached the pump OR 2 PC chassis screws
2 6mm external diameter carbon rod tubes, each 93mm long
Glue or epoxy to permanently bond the arms to the ends.
For strength, print the rear end as-is in the stl file, print the pump end sideways
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