The problem is in keeping the cost down. Aperture sights (even very simple ones) are fiddly things to make. I would have to charge in the region of $150 for them to be worth my time, and even then I would not be making much, if anything. Unfortunately that's just the reality of manual machines and small scale.
For Baikal's in particular, you would need much higher than standard front sights as well if the aperture was sitting on top of the dovetail.
Its a good idea, and there are bound to be people interested in the product, but probably not for the price tag that would be necessary.
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