Does anyone have experience with these sights? I was thinking of getting the AK version from Eastwave which sits closer over the bore. Appreciate any comments or suggestions.
I own one of each of the versions (overbore version, original military side version and the weaver version.
I originally bought them as accountremonts for my small AK collection, but have used them for my czech arms and other rifles.
The version you have on your picture is the overbore one. You won't be able to mount it on a Czech Arms rifle without modifying the mount on the rifle. The offset version uses the dragonov style mount and will fit with no modifications. Although I had to bend back the rear sling swivel (on the folding stock) with some pliers so that it wouldn't interfere with mounting the unit (which otherwise wouldn't clear it).
At the time I ordered mine, these were significantly cheaper than the EOtechs and Aimpoint units out there (not so much now unfortunately). I liked the fact that they were not electronic and battery dependent as well (even though with battery life being what it is in the Aimpoints, this argument is moot). You can always trust the Russians for low tech solutions

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Anyhow, zeroing the units was initially a maddening experience. The manual wasn't a total help, but with trial and error I figured things out quickly. There are no click adjustments, it is a "friction" adjustment system with lock screws.
Windage adjustment is 7.5 cm per division and elevation is 5 cm per division--pretty coarse but adequate for a cqb type sight. You can always adjust and guesstimate by friction adjusting within these marked divisions to get smaller impact adjustments.
For top ejecting rifles, I'd go with the side/offset model (less likely to interfere with case ejection--plus you're more likely to be able to access the locking adjustment screws without removing the unit from the rifle), although I found with the side/offset model I had a tendancy to tilt/cant the rifle to the right (for a rt hand shooter) while firing so as to get a better cheek weld. This of course screwed up any longer range shots you take because of rifle canting. (I'm the kinda guy who uses his black rifles for longer range shots so it's a bigger deal to me than people who're just shooting 25-50 m).
I still like these units, but as in everything, they have their pluses and minuses. I hope this helps you. If anything else comes to mind, feel free to let me know.
