I have a first gen PD35 that I wanted to mount on a rifle. I asked some Fenix reps if this would work since it is not listed on the compatible devices. Turns out it does work, and I've been very happy with it. I've done a handful of drills to test it's functionality and so far it is meeting expectations.

I installed this on an OLD TK11 (not tac model) flashlight after contacting Fenix to verify fitment. This switch is much nicer than the original switch I was using. I thought the lack of a coil design on the wire wouldn't give me enough length,but there is plenty to accommodate for the action on a shotgun.

Called customer service to see if the would fit an older light I have had. The recommended this one and it worked perfectly.

Pressure pad is fine. Mount is fine. Separately.
Can't use either though. Doesn't fit in the mount bought with it from Fenix. Website is lacking info or I'm blind. Why sell two seemingly related items on the same page if they don't fit one another.
Picatinny rail mount also is a spring loaded tool less button rail lock.

Great piece of equipment. Have not use it a lot at this point but it works extremely well currently.

It works well and the pad is not too big. It takes a little bit of pressure to activate the light but that helps from accidently activating it. Have not had it very long so don't know its about durability.