I have bought mine from RSP with the Anti-Cant Device. Service is top notch, fast and frendly, can only recommand it. When i was ready to order, OS Optic was already out of stock (few month ago), they ship all they have, folding or fixed type, to the sand box they tell me. Since it's war zone again, give them a try but i think it's a waisted time.
The device work very well, way much better than the cross hair lolll
Here is the 2 device bought from RSP
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respectfully
Sendero
The device work very well, way much better than the cross hair lolll
Here is the 2 device bought from RSP

.

.
respectfully
Sendero