While I too hate the CR batteries that thing looks way too long for a pistol. Now a rifle it would work for some. I also don't imagine there are any holsters yet to accommodate the light left on a pistol. I add that I haven't look either so if there is one then it's because I didn't bother looking.
Glock 22 (LWD .357 Sig barrel), Glock 27, Colt M4
Black Rifle Club member #224 Lone Star Glocker #134
NREMT-Paramedic TCCC Instructor