And very reasonable at that, considering all you had to do.
I just don't get it.
I can see the sense of a low mounted Bomar adjustable (Does anybody here remember the Melted Micro that preceded the Buried Bomar?) but just cannot get along with the notion of a hundred bucks worth of milling on the back end of the slide for a proprietary fixed sight. There are ample sights that fit the GI dovetail which leaves you with some choice of future changes.