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Drop in spring for Nerf Mega Double Breech..

Drop in upgrade spring for Nerf Delta Trooper..

Increase the dart travel distance with the new 9kg spring up grade from Worker...

Increase the FPS for your Longshot with this 9KG weight spring for the Nerf Longshot.It is recommended to install metal internal for the Longshot when installing a much heavier spring. Mod responsibly, fellow modders..