12 gauge Shotshell no brass

thingiverse

I couldn't get the original to fit in a Mossberg 500 chamber because the brass section diameter was too large and the rim was too thick. This revised version removes the distinct brass section while maintaining the smaller shell case diameter. A real shotgun shell casing is typically the same size as the case until fired. To address the issues I encountered with the original design, I reduced the thickness of the brass rim by 0.15mm. Although I haven't printed it yet, I'm confident that this adjustment will also resolve the problem of the bolt not locking completely. After sanding the original to fit, it loaded into the tube, chambered with a pump, and would fire dry before ejecting when cycling the pump again. I expect this revised version to behave in a similar manner. You can print at 100% for a more realistic weight, but for basic functionality, printing at 100% should not be necessary.