Okay, had a weird crash referencing TechGuns, something to do with malformed input around byte 70. I was merely flying around and loading chunks when this happened. No idea what caused it, but it is rather annoying, and if it ends up corrupting my world, I'll have no choice but to uninstall the mod and wait for an update that fixes the problem.

Crash log: https://pastebin.com/QRtnPF1e