I know there is a hex bolt but I was under the impression the remote switches were soldered in place under the cover ?
I just picked up new, never used M111 which has the slimline switch. There are 2 wires under the cover and the wires are soldered onto the body of the slimline switch. So, the slimline switch wasn't designed to be removable.
I'm pretty impressed with the 3 cell body of the M1xx weapon light. I've been playing Surefire Lego and found that the 3 cell body makes for a very nice holding and short 3 cell light. I attached a KT-4 on the M111 and mounted it on 92FS......weird. BUT, if for whatever reason you need to throw 225L using a pistol, I think this is the only solution. IMHO, the M1xx series would have made for a great long gun light.
Also, as Al pointed out earlier, one would also have to shave down a "tab" to make the light fit on a Picatinny Rails.
Anyone know the years that SF offered the P, W and M series pistol lights?