Scary,
I don't have an LCR either, but I have a J-frame with a lazer made by the same company that makes them for the LCR.
the lazer sits at the top of the right grip (looking from the rear of the revolver), or the outside grip on a right hand strong side carry. The batteries fit inside against the frame of the revolver, so you have to take the grip off to replace them, and can't see then when the grips are on the revolver.
It's very small, and pretty unnoticeable unless you need it. My J-frame still fits the same holster(s) it did before I put the lazergrip on it, and I see no reason why others shouldn't do the same.
Here's a picture of mine in a well worn holster I use for concealed carry. You can see the bulge at the top of the grip? That's the lazer. There's a push-button switch on the front of the grip that the shooter presses with the middle finger to activate the lazer.
Ok, so I did put some Lexol leather conditioner on the holster shortly after I took this picture. It needs it again now.
Daryl