The Viper series are manufactured in the Philippines.
Depending on where you're hunting, you might find a 200y zero the most useful! Give us a shout to discuss in more detail - 1.800.4VORTEX!
If mounted in quality rings at proper torque values, this is an outstanding choice! Check out the Pro-Series 30mm medium-height rings, PN# PR30-M!
On the Lupo, a set of the Vortex low-height Pro-Series 30mm rings would provide minimum clearance!
Here is a link: https://www.opticsplanet.com/v/pr30-l-vortex-pro-series-30mm-riflescope.html
Yes, the Vortex Viper HS 4-16x44mm 30mm Tube Second Focal Plane Rifle Scope will include protective lens caps, a 4" sunshade, and lens cloth.
The Butler Creek Flip Cover you need to for the objective lens is size 33 and can be found at the first link below. The size you need for the eyepiece is size 15 and can be found at the second link below.
https://www.opticsplanet.com/butler-creek-flip-open-scope-covers.html?_iv_objective-lens-diameter=51-dot-9-mm
https://www.opticsplanet.com/butler-creek-eyepiece-flip-open-scope-covers.html?_iv_eyepiece-lens-diameter=42-dot-2-mm&_iv_size=15
Yes, medium height rings should allow for enough clearance of the objective lens on this Vortex Viper HS 4-16x44mm Rifle Scope. You can also use the How-To Guide linked below to assist in selecting the correct height rings for your rifle:
https://www.opticsplanet.com/howto/how-to-how-to-measure-scope-height-scope-ring-height.html
Both the Vortex Viper and Vortex Diamond Back Rifle Scopes are durable. The Vortex Viper Rifle Scopes are considered a higher quality series of Vortex scopes. The Viper Series typically have some higher end features and clearer glass when comparing them to most Diamondback scopes. However, there are a few Vortex Diamondback scopes that have the same features as a lot of Vortex Vipers. To be able to give exact details comparing the two I would have to know exactly what Vortex Diamondback scope you are asking about. Both will work great on a Ruger American in .308 however, I recommend using this Vortex Viper HS 4-16x44mm Rifle Scope for that set up over a Vortex Diamondback.
These Ruger rings will work for this Vortex Viper HS 4-16x44mm.
https://www.opticsplanet.com/ruger-m77-scope-ring-set-30mm-high-blue-90407ru.html
This Viper 4-16x44 is an excellent choice for this application.