It should have worked - Precision Reflex PRi AR15 / M16 Flattop Riser w/ 3 Hole

This riser appears to be made well. It was purchased to raise the level of an Iray thermal scope with a quick attach mount. Unfortunately, Iray made their mount too thick in the clamping area so it would not work with this half-inch riser. The reason being is the mount does not have enough space between the screws on one side, and the clamp on the other side, to the Picatinny section on top. I wanted a half inch riser, but I was forced to purchase a different brand that provides a 5/8 inch riser to get the space for clamping.
I’m giving it a three star rating because there could be some changes that would be easily made and it may have issues with other mounts