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I became aware of the SEE ALL sight maybe 3-4 years ago, and may have started a thread here on same. The fact that it ran w/o batteries, and was relatively compact was attractive. I saw the price equal to an affordable red dot, which needed batteries, and some of those affordable dots were larger than the SEE ALL. I was having trouble running the iron sights on my clunker MISR AK. I cruised E-bay for about a yr, and ended up buying the sight much as pictured in the OP. I took that sight and attached it to an Ultimak rail on the gastube of said MISR . I positioned the sight as far rearward on the rail as possible....the sight ended up just ahead of the factory rear.
It improved my ability to shoot the AK better a good bit, and returned my iron sight group sizes with the AK (at 100 yds) back to my pre-50 yr old eyes results. The farther from your eye the sight is, the larger that black triangle appears. Out on the tube of the AK, scout style, it was pretty darn big and resultantly easy to see. The down side is, the bigger the aiming point gets, the more critical alignment becomes. The aiming point is plenty visible if there is any degree of light at all. There is no illumination in the sight.....total darkness, no sights. But that big wafer of green space plastic catches any ambient light about, and if you can see your target, there is enough light to shoot....which works for any of my uses.
As pictured, the early sights are square edged and needed some radius's on the corners to make them more sleek. I wrote an e-note to SeeAll suggesting same. Further, the exposed lense is open to impact, and after about a yr on the AK, I managed to slightly chip my lense at the top, very small, but proof the lense is vulnerable. I also suggested some type of arched housing to protect the lense as well. I did not like the "slide on" means of attachment either, they needed some type of clamp on affair to make the sight more compatible with more rail set ups. I doubt my little email effected the change, but the new versions of the SeeAll incorporate all those changes. I was on the right track at least.
Many who are critical of the SeeAll dislike the inability to see the whole target. These folks I suspect are accustomed to running a dot, where the the dot of a few MOA size is simply pasted on the target in an otherwise clear, circular FOV. The SeeAll does not work like that, and in use, functions much like a standard iron sight/leaf-blade arrangement as in traditional handgun sights or simple sights on a .22 rifle in that one cannot see the whole target, it is partially obstructed by the sights themselves. If you are a accustomed to traditional iron sights, the SeeAll should not give you trouble. If you have only shot a dot optic, or a 'scope, the SeeAll may be to your dislike.
I eventually pulled the SeeAll off the AK, not for any dislike or problem, I simpy found another sight system I wanted to run on the clunker for fun. My standard iron sights on the choked slug barrel of my turkey gun are giving me fits.....and the SeeAll is headed onto the old Rem 870 as soon as I get the mount situation resolved, (my old gun is not drilled and tapped for a rail) I intend to see if that will be a suitable aiming system for gobblers.........and indeed, I suspect the SeeAll may be at its best on the shotgun. No batteries, not susceptible to water damage, and any slight misalignment on my part will be compensated by the forgiving nature of a shotgun pellet pattern. The SeeAll is at its best at typical iron sight distances, at home with the so-so accuracy of the AK, and may well be an ideal gobbler sight. We shall see.