Re: NightForce lens protection
On the subject of lens protection, I run a tenebrax honeycomb sunshade/ARD on mine, partially to help with glare (without needing the 4" sunshade NF provides) but mostly because it gives me a little more protection for the front lens. For the most part I don't need to worry about crap bouncing off the end of the scope and thru the front lens so long as it is on there (cause that flexible rubber sure as shit ain't gonna slow much down) and it also helps keep light rain off the front glass. I personally can't tell much difference in the image unless nighttime and in those rare cases it's no big deal to spin it off and the bikini cover still just slips into place onto the scope as well as before.
ETA: To be clear, I'm talking about the quality 1-2" long screw-in tenebrex ARD's, not the POS slip-on filter thingies.