The Demophage. Designed by 404. This pump action spring powered blaster features a single pin quick spring swap, Linear Rail mounted pump slide for smooth priming, and is capable of using the expansive library of Lynx compatible springs to suit any game requirements. 

Find the files here: https://www.printables.com/model/1392994-demophage-pump-action-foam-dart-blaster

Build Guide: https://docs.google.com/document/d/1eX_gcuyswXY66zZaXkH86bshMFVqgrNFBJmBLL5Mw58/edit?usp=sharing