SureFire M2 Millennium Centurion, retail $168.00 (
Manufactured by SureFire (
Last updated 11-14-09

The M2 Millennium Centurion is a rough and tough 2-cell flashlight made by SureFire. Like with SureFire's other products, the M2 features a type III hard anodize coating on the body, and is about as tough as they come.

The M2 also has a shock isolation bezel (SIB), so the light bulb in there is much less likely to become broken when the flashlight is dropped or affixed to a gun and subjected to recoil when the gun is shot.

You don't have to own or use a gun to get your money's worth out of an M2 though.


To use your M2, put batteries in it first (see below) and then you're good to go.

For a shot of light anytime, press and hold in the rubber button on the tailcap. Release it to turn the M2 back off.

For continuous (hands-free) light, turn the M2's tailcap clockwise (as if tightening it). The light will then come on and stay on. Turn the tailcap counterclockwise (as if loosening it) to turn the M2 back off.

The M2 is equipped with a LOTC (Lock Out TailCap). There is a notch (witness mark) on the flashlight, and another notch on the tailcap. Unscrew the tailcap one full turn, using the notches as a guide. The light will then be locked off, and cannot turn on during storage or transport, regardless of how it gets squished.

The light features a rubber combat grip on the barrel, so you can use it with a pistol using the SureFire/Rogers combat grip. Since I don't have a gun or anything that looks like one, I cannot demonstrate this grip for you.

To change the batteries in your M2, unscrew the tailcap and throw it away...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead. :-)
Tip out the two dead CR123A cells and dispose of or recycle them as you see fit. Slip two new CR123A cells in the barrel, button (+) end first (towards the head), and screw the tailcap back on. Unscrew it slightly when your M2 springs to life. Told ya you'd need that tailcap, aren't you glad you didn't throw it out now? ;-)

Current draw was measured at 2.25 amps with the P61 lamp assembly that came with the flashlight. Current draw with the P60 lamp assembly I found later was measured at 1.11 amps.

Sooner or later, you'll blow a bulb, and have to relamp the flashlight.
To do this, unscrew the head, and remove the burnt-out lamp/reflector assembly. I don't believe it is recyclable, so throw it in the garbage can. Place a new P60 or P61 lamp assembly in the flashlight head, reflector surface aimed toward the front of the light head. Don't invert the head, or the lamp assembly might fall out. Pick up the head, mate it to the flashlight barrel however you see fit, and screw the head back onto the barrel until it's snug. If the lamp assembly falls out before you have the head and barrel of the light back together, pick it up, put it back in the head, and try again. No shame in that.

For an incandescent flashlight, the M2 Millennium Centurion is about as tough as they come. The body is made of a thick aluminum which is hard-anodized with a Type III anodizing. The bezel has a pyrex glass lens inset into it; which is more scratch-and-melt-resistant than the usual lexan (clear plastic) lenses found in other incandescent flashlights.

The light appears to be quite durable, and easily withstood being smacked against a steel rod a number of times. No scratches or other marks appeared on the barrel, and the flashlight appeared to work just fine after this treatment.

Suction tests done both at the head and tail showed the light holds a vaccume, so it should do fine when it falls into water like puddles, toilet bowls, and things like that. I don't know the depth rating, but it will certainly do fine in rain or snow, or if it falls into shallow water. There are two O-rings at the tail end of the barrel, and one O-ring at the head end of the barrel. So I wouldn't worry at all about using the light in rain or snow.

There is a gold colored material inside the barrel; please do not try to remove it. This is a Chemkote treatment that helps protect the flashlight from corrosion caused by water or bad batteries.

A generous spring steel clip is affixed to the flashlight, allowing you to clip it bezel-up to coats, pockets, or other reasonably thick fabric.

More information will be posted later. For the time being, I just want to get this page uploaded and call it a night. :-)

Beam photograph at ~12".
With a P61 lamp assembly, it measures 2,460 candlepower.
With a P60 lamp assembly, it measures 1,400 candlepower.
Both measurements were taken on a Meterman LM631 light meter.
I can't do lumens (you need an integrating sphere for that), so please don't ask.

Beam spot (with P61 lamp ass'y) at approximately 12
feet, above and just to the left of my Christmas tree.

Spectrographic plot
Spectrographic analysis of the incandescent bulb in this flashlight.
USB2000 spectrometer graciously donated by P.L.

ProMetric analysis
Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

I believe the SureFire M2 Centurion was received in mid-2002. I apologise for taking so long to get it on my website.

UPDATE: 04-29-05
SureFire has confirmed that all current SureFire lights should be waterproof to about 33 feet/10 meters. Some evaluations were posted before Surefire made the affirmation that their lights were watertight to 1 atmosphere depth. Any new SureFire lights you purchase now should be considered waterproof to 33' (10M).

Very bright (with the P61 lamp assembly)
Very durable & shock-resistant, even the lamp, thanks to the shock isolation bezel.

Slight anodizing color mismatch - however this is normal with the hard anodizing process and will not figure into the product's final rating.

    PRODUCT TYPE: Tactical-style flashlight
    LAMP TYPE: Incandescent, high-pressure xenon fill
    No. OF LAMPS: 1
    BEAM TYPE: Mainly circular hotspot with softer corona
    SWITCH TYPE: Push tailcap momentary; twist tailcap continuous
    BEZEL: Clear pyrex glass window recessed in metal head
    BATTERY: 2x CR123A lithium
    CURRENT CONSUMPTION: 2.25 amps (with P61 lamp ass'y) 1.11 amps (with P60 lamp ass'y)
    SUBMERSIBLE: Unknown
    ACCESSORIES: Batteries (I think), P60 & P61 lamp assemblies (I think)
    WARRANTY: Lifetime


    Star Rating

SureFire M2 Millennium Centurion *

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