The Kinetic Development Group SIDELOK Mount for the COMP M4 will not work with the Vortex Strikefire II. That red dot does not share the COMP M4 mounting footprint and can only be mounted using a 30mm ring.
The Kinetic Development Group SIDELOK Mount provides 0.65" of height from the bottom of the rail to the top of the mount. This will translate to an optic height of about 1.4" or an absolute co-witness.
Yes. It will be compatible.
This should definitely fit the top rail on the VR80. It should mount from the side of the rail and rock onto the slot from right to left. The "lever" should be in the pushed in and when it gets mounted the "lever" will come out to the locked position. Here is a good video showing a Sidelok being mounted:
https://www.youtube.com/watch?v=m5FJJ7eInRs
No, this is only compatible with the Aimpoint Models Patrol Rifle Optic (PRO) and the Comp M4.
No, the Comp M5 follows the H1/T1 mount pattern and does not share a common mounting pattern with the Comp M4.
No, this is for Aimpoint Comp M4 which does not follow a common mount pattern as any ACOG models.
This is just a replacement base for the Aimpoint ring mount, so if you do not have their mount for the CompM4 already, you would have to purchase the ring mount separately and then swap this base onto it.