I don't know about Surefire but at
Glockmeister you can find the M3 System under "Accessories", here is a breakdown of the information:
M3 Technical Data:
M3 Dimensions: Length; 3.4" Width; 1.57" Height; 1.52"
Weight: 3.3 oz including batteries.
Lamp Type: Tungsten Halogen
Run Time: Minimum 30 minutes continuous
Battery: Lithium Type
Voltage: 6 volts DC
Operating Temperature: -32 C to + 65 C (-26 F to 149 F)
Why The M3?:
This new generation of lighting allows you to aim and illuminate simultaneously as the mounted light is co-axial with the bore.
It is preferable to night vision equipment and lasers in most instances because the new lights are more compact, easier to handle and most importantly, provide significantly clearer identification of the target.
The M3 Tactical Illuminator, which is compatible with the new Glock handguns and other popular brands, lives up to its reputation.
It is unique in its class because of the combination of engineering features it offers.
It weighs only 3.3 oz. making it a third of the weight of some muzzle-heavy models on the market.
It is manufactured by Insight Technologies Incorporated, the foremost supplier of tactical lights and lasers for U.S Special Operations.
Both momentary and steady-on -switches are standard. Made of lightweight polymer materials, it is resistant to chemicals.
A powerful six-volt battery is standard, compared to three volt on some competitor's models.
The focusable beam is adjustable from spot to flood lighting.
It is easy to use in all settings- home, tactical, police and concealed carry - as it operates by fingertip, attaches and detaches in less than 2 seconds and fits in a fanny pack, pocket or glove box.