UPDATE III (June 3rd 2005)
After sending the light to Glock Austria we quickly got a reply from the factory representative. The light we sent back, was tested by the factory and it had functioned properly without problems. However the Glock representative stated that the light was a 1st generation model and the contact springs may have been the issue all along. Glock promptly replaced the light with a 2nd generation model which was sent to us for no charge. This time the light came in a proper factory storage box included with instruction manual and a spare bulb. Nice work by Glock! We will be testing the 2nd gen light in the near future.

UPDATE II (-05)
The light went out completely. Replacing the bulb did nothing. The light was sent to the company that sold it and when it returned it worked again...for a while. The store representative said something about the battery springs needing to be bent from time to time, but that doesn't inspire confidence to the product too much. We will be sending it back to Glock to hear what they have to say. On closer inspection we also noticed a crack on the light body, but that doesn't necessarily have anything to do with the malfunctions. It only makes one wonder where it came from since the light hasn't ever been dropped etc.

UPDATE
The light has experienced some failures during firing. On occasion the light dies completely but comes back on after some shaking. The problem persisted for some time but has recently mysteriously disappeared. As for holsters the excellent Safariland 6004 holster is currently made to fit the Glock light.

REVIEW
Glock shooters have been waiting for a factory light for the Glock pistols for a while now and now it's finally on the market. As far as competition comes Sure-Fire pretty much dropped the ball and made their Millennium lights too big and bulky and even "compact and lightweight" Nitrolon P-series lights are noticeably bigger than the M3 or the new Glock light. Do doubt though that the Millennium light is superior in brightness to the Insight tech. or Glock light.
Insight technologies filled the gap for a compact pistol mounted light by introducing the M3. Since then Insight has expanded their product range to include systems that include both light and a laser. Their latest innovation is an M3 based light equipped with an additional led light.

Enough about the competition, lets get into business.
The light arrived in brown cardboard box wrapped in bubble wrap. Curiously enough there were no instructions or warranty cards whatsoever. (probably a mishap by the seller)

The new Glock light is a truly compact unit that accepts two 3V batteries just like the M3 or the classic Sure-Fire 6P.
The unit is really light and without batteries weighs less than an empty G 17 magazine. In fact it seems to be lightest light on the market because it's worst competition weight wise is the M3 and the M3 is just slightly heavier.

The battery compartment cover is on the top of the unit and the lid is made waterproof with the help of an O-ring. Once the unit is placed on the gun there is no way for the battery lid to open accidentally. This is good because the battery cover is not attached to the rest of the unit and would probably get lost if the battery lid were to accidentally open.

The batteries are easy to insert, but removing them without a tool is tricky. Luckily the battery cover suits perfectly for the job. Knowing Glocks ingenuity in product design we firmly believe that this is a design feature.

The bezel looks similar to the competition and the spot can be adjusted by rotating the bezel. The light the unit produces seems to be in par with the Sure-Fire 6P and the M3. We say seems, because we didn't have any measuring equipment at hand and the evaluation was made with the naked eye. The beam of the Glock light is not as smooth as the one that the Sure-Fire produces due to the design of the reflector.

As on would expect the light fits the gun perfectly and snaps firmly on the rails. The locking mechanism is similar to the M3, which means that the locking is achieved with a bar that raises to the cut in the rail on the dust cover. Unlike some of the M3 lights we have used, the Glock light is also easy to remove and requires no effort. The Glock light "rides" a little lower than the M3 but in exchange is a bit narrower. When the unit is in place on a G 17 it extends only a few millimeters past the tip of the barrel.Once in place on the gun, the unit balances the gun nicely without being too heavy or bulky.

There are switches on both sides of the unit so it can be operated with the left or right hand. The switch operates so that the left and right hand levers move simultaneously so that when you press the left side lever down the right side lever will also go down and vice versa. The switch itself is not as good as the one on the M3 for example. There is only a steady on or off function. With a little practice and finger technique we were however able have the light function as if it had a rocker switch.

We haven't seen any holsters for this particular unit and holsters designed for the M3 generally will not fit the Glock light.
Holsters made for the Sure-Fire Nitrolon P-series MAY fit the Glock light, but we expect that holster makers will soon introduce
models designed specifically for the Glock light.

Whether or not the unit will hold up against extended shooting and abuse only time will tell. All in all a good product for its price.