Herschel. I don't know those guns at all, but if there is a land, there has to be a groove. So, I see four things spiraling down the barrel. Two have to be lands, two have to be grooves. Lands and grooves look like they are about equal width.

At least that is what I see.


_________
BrentD, (Professor - just for Stan)
=>/

[Linked Image from i.imgur.com]