My M3 Tactical Light fits quite easily onto the Glock 23 front rail. You simply start it onto the accessory rail and push it rearward until it 'clicks' into place. The M3 fits up almost against the front of the trigger guard and extends about 1/4" past the end of the barrel. When you lay your trigger finger along the outside of the trigger guard it rest right on the M3 rocker-switch. Pressing the switch downward (clockwise) puts it into the spring loaded 'momentary' ON position, when you release it, it goes off. Pushing it upward (counter-clockwise) puts it into the 'LOCKED ON' position. There is a rocker-switch tab on BOTH SIDES so it can be controlled with either hand. Removing it is almost as easy as putting it on.... simply pull down on the the 'locking bar' that fits into the grove on the bottom of the front rail assy with your thumb and forefinger of your left hand while pushing forward with your right thumb or finger on the rear of the M3 and its off.
The M3 can be focused for spot or flood beam operation. The price you stated is pretty good.... I paid about $175 for mine and it listed for $199.
It's expensive for a Tactical Light, but quite effective for what you want.
If you get it, pick up a spare set of "photo lithium" batteries for it - they last a long time and have about a 10 year shelf-life (if you don't use it, the batteries don't get weaker like alkalines do). I'm still using the set I bought for it new. You'll really be surprised at how "BRIGHT" it is in a darkened room. If you 'shine' it in your own eyes, all you can see for about 10 minutes is a little 'white circle' in front of your face after you turn it off. I love mine.
PS: I also have the Meprolite "night sights" on mine and they really stand out in any subdued light situation or darkened room. You don't have any problem finding your gun at night with the "night sights" on it - they're like having a neon sign on it.
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