I'm not big on lasers, but what this thing needs is some sort of a pressure switch on the grip.
Yes, I realize it would break contact and the laser would turn off as soon as the slide started moving. But think about it. The gun is in recoil anyway and the laser would not be on target anyway. By the time the slide closed and you were re-aligning on the target the laser would be back on. You would probably never notice it turning on and off.
I still think it is something for the OTHER guy to have. While he's trying to find his dot on me, I'm going to be doing a full fighting drawstroke and lighting HIM up the old fashioned way!
Ceterum censeo, inferensus Islam delenda est"