[Danzig]

I've heard it'll fit in M-3/TLR-1 holsters. I'd check first. I'm interested in it because it uses AA batteries instead of expensive CR123's. Insight supplies military and are a pretty reliable light.

 

[Danzig]

I was thinking WL Series. The one your interested in is the replacement for the M-3 and does fit existing holsters. If you can get it for a good price (under $150) I'd do it. TLR-1 series are just as good IMO and usually cheaper.

 

[Danzig]

From US Cavalry store;
The Insight W150 Tactical Weapon Light is a ruggedly built LED weapon light featuring a hard-coat anodized aluminum body that is designed to fit existing M3 holsters. Its powerful 150 Lumens of stunning white light from a Cree LED powered by two 3V CR123A lithium batteries (Included) giving the WX150 just over two hours of run time.