Anyone have a X300 with the slide on mount(A) that has tried it on their Dagger? Tight, Loose?

Here's my experience,

Compact Dagger^TM and SureFire X300U A vs B

Someone in the know recently suggested that the Compact Dagger^TM accessory rail is Picatinny rail.  Maybe I didn't spend enough time with the SureFire X300U-A Picatinny Lever Latch and Picatinny Rail Latch.  I thought I would've tried both.

I really think the X300U-B's T-slot is the superior mounting system.  You just need to ensure the T-slot thumbscrew clamp is tight enough that the weapon light doesn't come loose, yet not so tight as to deform the frame.