Like the title says, this question is to the supporting vendors here who sell optic rails and side rails. I have a standard white ring sight PS90 and am going to be buying a optic for it and need a optic rail, probably going to pick up side rails too while I am at it. My question is, other than your price compared to FN's price for there model, what makes yours better than theirs? I like the idea of the back up sight FN built into their rail but it is not completely necesarry with the emergency sights already there. I guess I am asking for the vendors to "sell" me on their product over the FN made rail. Also, anyone who has purchased one from a supporting vendor...I would appreciate your thoughts on the product as well. Thanks!