If you really think about them, they could be great. You don't need a special holster to fit the laser. They have a small footprint, take up very little space. They would leave the front rail available for whatever. They can not weight much. They would still act as a open sight. Laserlyte's website states they are made out of stainless steel. They can be set to steady or flashing. They have an auto off feature.
My only question is how do you activate them. Where is the button?
I also saw they have a similar style sight for the front rail on tactical rifle.
Bob