I have the 57180 with Alumina lens caps.
It is one of the few scopes I own, where I have no complaints at all.
I also have a 55144 [40mm objective version] that serves me well.
I would buy more Leupold scopes, but their web site is impossible for me to find out anything.
Clark, good looking stick. You don't see many falling blocks around here
Are those Burris XTR rings?