Well made, but don't fit - Strike SISIDEWINDER Sidewinder Iron Sights AR-15 Black

I waited on back order for these sights for awhile, and was excited to receive them. They are compact and a great idea, but would not fit on any rail I tried, including LWRC, JL BIllet, and S&W. The mount seems to be 1/2-2/3 as deep as it needs to be to fit onto the rail. I ignored similar reviews when I ordered them figuring they were just a tight fit, but was wrong. For those wondering, they do not lock into place and there is only one aperture on the rear sight.
Unfortunately I will be returning these.