Re: laser sight
I put a crimson trace laser on my Kahr MK 40. You simply replace the origional grips with the crimson trace grips, the presure switch is on the front of the grips so when you grip the gun your fingers curled around the grips turn on the light. While there is an of switch the company recommends you do not turn it to off, since you will not be using battery power unless you ae gripping the gun. The grips added no bulk to the gun although I wouldn't have mined as I have big hands. The gun fit perfectly in the holster I had before I installed the grips.
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!