Quoted:Thanks for the kind words - always have a good time messing around in the dark with this stuff. Mine's in front of the 2.5-10x32 on the mk12, so it's a little bigger objective than most of the clones. The -30 runs beautifully at all zoom settings of that scope but does make eye relief/box a little tighter - you have to make sure your head is in the right spot. I should really throw it in front of a 5-20 or similar to check out where the resolution falls off but I'm assuming around 14-15x you'd be getting big enough grain on the tube where you'd have diminishing returns (unless you were milling something pretty big and it was more helpful on your reticle to zoom in more to get a refined measurement).
I would assume yes, it's a very similar NV tube in them so normal precautions should be taken to make sure it doesn't get left on in the daytime. When you turn it on with the adjustment knob, it immediately goes to its highest gain setting, then you continue to twist to turn it down to minimum. I keep the front rubber cap on when I turn on the unit, crank the knob all the way down, then slide the cap up. I'm sure the tube would be fine, but I just got it and am still a little touchy with it ;) It's an autogated L3 tube though, so the power supply would keep up and dial things down if it got too bright.
In the 10-15x range is the commonly advertised top end before grain becomes an issue.
Maybe I'll take a little video clip showing what the rear of the unit looks like to the naked eye and how it's a pretty small image that your scope is zooming in on. When back at 2.5x in my Nightforce you kinda feel like you're looking through a tube, whereas bumping it up to 3-5x it looks a lot more natural. For SFP/FFP, the scope would behave just like in the daytime. You'd have to zoom a SFP all the way in to get accurate mil-measurements and if it was a higher-powered scope, you might get a grainy image. So for something above 12x or so, I'd probably steer you towards FFP to make sure you could range things at the lower zoom levels.
The really cool thing about these clip on NV devices is that they have optics inside them that maintain the straight path of the light coming through them. You could have a buddy hand hold the -30 in front of your scope and it'd still maintain zero. It's optimal to have the day scope lined up directly behind it and mostly parallel, but if for example you have high or low rings and it's not vertically aligned perfectly, it will not affect the zero. Your day scope just needs to be able to see some of the green image in the -30. They use something KAC calls an Adjustable Wedge Prism (or a Risley prism pair) to zero the units at the factory so they're within the 0.5MOA spec for POI shift - here's their patent, with some neat sketches showing all the optical elements in a unit:
https://patents.google.com/patent/US20060109544
There's also the broader clip-on NV patent from L-3 that makes for some good reading about the optics as well -
https://patents.google.com/patent/US20080043322A1/en
I think it's a huge advantage over something like a SIMRAD that requires precise mounting. Small variations in pic rail alignment or forward NV mounts on bolt guns become a non-issue.
KAC also have the new battery housings patented - from what I heard that's why these refurb units have been hitting the commercial market (gov clients wanted flexibility of using AA or CR123 in the units and the refurbs are the dual-AA housings) -
https://patents.google.com/patent/US7576515B2/en?assignee=Knight+s+Armament+Co
Edit - on the MAWL clearance. The -30 is just really low - I even have to remove the KAC front sight to get it to mount or else it’ll interfere with the big focus adjustment knob.