The Sledgehammer is my custom-designed shell ejecting dart blaster. It functions just like a real pump action shotgun.
This video will show you how to assemble your blaster from the hardware kit available here: https://www.wadedesignsllc.com/
All the .step files you will need to print are available here: https://makerworld.com/en/models/2767256-sledgehammer-shell-ejecting-dart-blaster
You will need the following tools:
2 mm Allen key
2.5 mm Allen key
3 mm Allen key
long 4 mm Allen key
small Philips head screw driver
soldering iron
super lube O-ring silicone grease
a flathead screw driver or the spatula you use to remove prints from your print bed