Yes, this VISM 45 Degree Side to Side Vertical Grip is designed to attach to picatinny/1913 rails, like that found on the Komrad 12GA.
VISM does not provide specific dimensions for their 45 Degree Side to Side Vertical Grip. I would recommend reaching out to them directly for more information. Their contact info is linked below:
https://www.ncstar.com/company-info/contact-us/
Great idea I think it should work perfectly as long as you have the Picatinny rail
This mounts onto Weaver/Picatinny/MIL-STD 1913 rails with an all metal mount and pivot mechanism. It shouldn't wobble much, but some can be expected like any adjustable vertical grip.
It should if you have a picatinny rail at the 6 o'clock position.
This mounts onto Weaver/Picatinny/MIL-STD 1913 rails, so it should fit a Rock River picatinny rail. Loosen or remove the screws on the side of the mount to achieve a wider mount width, set it in place, and reattach/tighten the screws on the mount.
It should if you have a picatinny rail at the 6 o'clock position.