This sitemark if left still will shut down in 1 hr 15 min. Long enough t9 stay on thru a church sevice. It doesnt have the auto on but with a little practice now if i have time to lay hands on the rifle i can have it on by the time the stock hits my shoulder. Plus at 25 yards and in i can use the iron front site lookjng thru the sitemark if its off. Or use the groove under the site mount to use full irons.I have one of those SightMark M-Specs on the 300 BO pistol, love it. It's a well made product, easily on par with the EOtechs or the more expensive Holosuns. The only complaints I have are I wish you could change the reticle colors. I would like red, green and blue (I mean el cheapo $20 reflexes have that ability), and I wish the auto off feature didn't totally shut it down after 12 hours. I'd like the shake and wake feature to just stay on all the time. Beyond that though, it's a great sight especially for the price.
I was all set to go with an EOtech, but I don't like the "true" laser reticle, it's grainy and has a bit of a dazzling effect to my eye. I'm sure they've fixed the issues by now, but EOtech was sued by the military at one point because the sights malfunctioned in the cold and some reviews even today mention some issues with them in cold weather.
I like the reticle though i wish i had a rich uncle so i could mount night vision as it has six night vision settings .
Anyway thanks again for the replies. Sighting the AK was a whole different animal than zeroing the AR