Your Browser is OutdatedQ&A for Nikon Monarch 3 4-16x42 Hunting Rifle Scope — 7 Questions & 7 Answers
Most DEMO items listed on our site are factory refurbished models while others were previously unpacked and used for testing, display, sampling, training or demonstration purposes by the manufacturer or us. The only Cons would be that the product may not be in perfect cosmetic condition, but should still be in working order, and also may not include all of the new accessories that the new units do.
They are essentially the same scope (the M in M-308 actually stands for Monarch), but the M-308 gets tactical turrets instead of capped turrets, and is pre-calibrated for the .308 round.
AR rifles require an extra high mount due to the stock being nearly level with top of the rifle (keeping your head from getting level with a lower scope mount). 1.5" is the height for absolute co-witness with iron sights (if your rifle has them), and 1.75" or similar is the height for lower 1/3rd co-witness with iron sights.
A 2" offset should be sufficient but a 3" offset will work too. These are a popular option: https://www.opticsplanet.com/vortex-cantilever-ring-mount-for-1-inch-tube.html
The tube diameter is 1".
Nikon does not offer a sunshade that is listed compatible with this specific scope. They do however offer an ARD attachment for this scope, here is a link to it:
https://www.opticsplanet.com/nikon-42mm-ard-for-monarch-scopes.html
Yes, DEMO scopes have the same warranty as new models.