The JetBeam RRT2 is a great flashlight, because of its dial a mode and locked in "programming" of strobe, high beam, whatever. I mounted under 12 ga. for home defense. Never fired. Maybe part user error, so here's the point: Ensure the light is NOT attached to the weapon when screwing the end cap on/off. Detach the Velcro. I didn't, and in no time, the pressure switch and button on the end cap did not work reliably. I guess a short must have happened. Frustrated with unreliability, I ordered another high-end flashlight. After new one arrived, I discovered that replacing the end cap to the original (without pressure switch), the light performs flawlessly. Now that it works again, RRT is my favorite flashlight. May order another pressure switch, and take my own advice above.

Product is nice but it will not work with the Magpul illumination kit, the pressure switch is too big to fit in the switch pad mounting plates.