I just received my clamp today. Let me parrot what NikDrak said that there are no clearance issues with the standard non mossberg clamp from Nordic. The beretta specific clamp should allow you to mount one “foot” of the clamp under the front sight but this is not necessary. You can use the standard clamp and just move it back a bit. There is a raised lip on the KZ tube but you have plenty of room in front of it to clear it and the front sight base. Still waiting on my Nordic but this works fine in the mean time.