I bought the TK22 Fenix flashlight and then this ring to mount the flashlight onto picatinny rails. It does the job, but it's a permanent-ish solution. So if I'm taking the instrument on which the rails are mounted out during the day, I would need an allen wrench to dismount the flashlight and ring, which takes some time. I wish the ring came with quick release, but then the light might not snugly attach, so I guess this is the best to expect, and it does the job.
Pros: Does the job
Cons: Hard to install, uninstall
This review was written in the old system and had content requirements that are different than reviews written today.