Mossberg 930: Was going to shorten barrel, decided to replace it... Then sold it!

[GH41]

I've used a basic pipe cutter to good effect. Clean, even cut.
Tighten, spin back and forth. Tighten again, spin back and forth. Repeat as necessary.
The vented rib will need to be hacksawed, filed, and blued.
https://www.lowes.com/pd/BrassCraft-...tter/999903321

Or you could get a new barrel.

Please tell us you are drunk.