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The dog leg rail with built in peep from http://www.texasweaponsystems.com is another option. No need to replace the dustcover and you can mount a RD low enough to co-witness if you're into that kind of thing. Runs about $160 iirc.
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Have you tried one?
The TWS rail is nice and a good option for a magnified optic. I have one on my Saiga .308 (can't use an Ultimak on it due to the thicker barrel). It's a quality piece and has a nifty flip up rear BUIS.
However, I cannot get any red dot I have to co-witness with it. I tried an Aimpoint CompC3 and even a Bushnell TRS-25 (that was specifically recommended to co-witness with the rail). The rail just sits too high in relation to the sights, it has to clear the top cover after all. A lot of people on the Interweb are saying that you can co-witness a TWS rail and a red dot. I don't know if they are just repeating bad info, or there is a LOT of variation in sight heights, but it ended up wasting a bunch of money for me.
Now I did find that on a Saiga .223, a Tech-sights rear aperture and original front sight will co-witness very nicely with an Aimpoint CompC3 on an Ultimak.