Getting the right one - Aimpoint Picatinny Mount Base

Can't stress how important it is to get the correct piece for your project. I went thru two separate orders (one with OpticsPlanet and another vendor) for the similar but still wrong mount for my Aimpoint CompM5. Once I got the correct mount, mounting the optic on the rifle was a breeze. Do your research to find the right mount before assuming and remember that all mounts are not the same.

Might see some gaps after tightening the mount (with the 39mm spacer, in my case) with the optic. Having ordered a complete optic with mount and spacer prior, I noticed the same on that mount as well when comparing. Rock-solid after finding the sweet spot on the Torison Nut.