This is my go-to light for weapon mounting. i have 4. - SureFire M600DF Ultra Scout Light Dual Fuel LED Weapon

I have owned and played with many weapons lights. This is my current go-to and, except for special circumstances where you want something shorter, I’m not sure why anyone would want anything else. Even the price is reasonable compared to others.

You get a reasonable weight, top of the category lumens AND the ability to use either 123 batteries or a rechargeable battery. What more could you ask for?

OK, one proviso and the reason I give it 4 stars instead of 5: If you want to run a tape switch, the Surefire switches are overpriced. Expect to pay a lot of $$$ to run a good switch.