The Bobro Engineering High Top Upper Ring is compatible with all Bobro Engineering Precision Optic Mounts that utilize the newer style LBX interlocking rings.
The Rings have 2 mounting surfaces; one is straight up and the other is at a 45 degree angle. The ring can be mounted so that the angled surface is either on the left or right side.
The mounting plate is separate so that the base ring can be configured to mount to various optics.
If the optic is mounted straight up, merely lifting your head will allow the secondary optic to be utilized. When mounted at a 45 degree angle, rotating the weapon will permit the use of the secondary optic. A secondary optic can be used as a backup to the primary, as a primary at a specific range, or for both purposes (typical).
All High Top rings come with the appropriate hardware and wrenches, including a stainless steel sealing plate for the optics that require them.