Got a laser in your sights?  Picking the right laser for the job
     Guide rod lasers: Guide rod lasers are also available from
several manufacturers, including Laser Aiming Systems of
Burnsville, Minnesota, a manufacturer of green laser sights.
These units have a laser mounted inside a guide rod that
shooters use in place of the factory-installed one. They also
have an on/off switch that is normally mounted on the outside of
the weapon. As this type of system does not change the outside
dimensions of the weapon, it allows officers to mount the laser
without purchasing a new holster. It also mounts the laser
directly under the bore, which helps ensure a better zero of the
weapon.       Rail-mounted lasers: The third type of laser sight
is the rail-mounted laser, which comes in a variety of shapes
and sizes. These sights mount on a weapon's Picatinny-style
accessory rail. If users are putting one on a long gun, this is
most likely the type of laser they will use. This rail-mounted
system is also available fo