Thread:The Augster at NK/@comment-180.190.94.125-20151116045833/@comment-25302371-20151117224715

Dondorbus has barrel thickness of about width of trigger guard

which I believe approx. 2 inches or so, which is 50mm

if it's shooting bullets of size, it needs thicker barrel, so assuming something like 3:1 ratio of bullet thickness and barrel thickness, that's mean inside would be 3/5 of 50mm, which is 30mm.

but then, you need a little more smaller so it can actually move through barrel, then there's rifling (helical indenting inside the barrel) which would make it even smaller...