The reason for the "grinder and a file" metaphor was because that's roughly the tech level at which Khyber Pass guns are made. Now I wouldn't necessarily put a

The reason for the "grinder and a file" metaphor was because that's roughly the tech level at which Khyber Pass guns are made. Now I wouldn't necessarily put a +P load through them, but the better ones are reasonably functional. Also, how do you think the DPRK makes it shells? :-).