BreakShot

To start, you probably shouldn't print these. I'll be releasing a functional model eventually.

I definitely haven't fixed barrel alignment issue,and most versions do not work. You will still probably need a plumbing gasket like the one in the MakeTestBattle video, and while this should work, it also might not, as like I said, not tested.

An add-on to the SledgeFire that shortens the barrel.

A replacement barrel for the sledgefire, if it broke like mine. The shells don't eject, but the fit is loose enough to take the shell out easily. You need the Top, Barrel, and Bottom Piece, and Hinge Cover. The rails and barrel covers are optional.
It's kind of tested, as previous versions work alright with sanding. May still require some sanding.
Also, I have no idea how to use Fusion, so I created this with Tinkercad. That sadly means no STP files, only the STL.

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Printing

The rail, barrel, hinge cover and barrel covers shouldn't need supports.
Actually printed on a Prusa