Surefire M640DFT Scout Light, Flashlight, 1000 Lumens, Z68 On/Off Tailcap, Anodized Finish, Black, Includes MLOK Adapter & 18650 Rechargeable Battery M640DFT-BK-PRO SureFire Turbo Scout Light Pro WeaponLights are the right tools for your mission if you carry a long gun. Thanks to their Low-Profile Mount (LPM)" they deliver unprecedented versatility" which allows the user to optimize the light's position relative to the rail and other attached firearm accessories. Roughly the same size as their non-Turbo counterparts" the M340DFT-PRO and M640DFT-PRO securely mount to M-Lok or Picatinny rails and deliver up to 100"000 candela of high-intensity light" so you'll see down the longest corridors and through the darkest windows. Dual Fuel allows you to power up with the appropriate rechargeable 18350 or 18650 batteries or 123 lithium primary batteries. The M340DFT-PRO is the king of compact" while the M640DFT-PRO offers greater runtime.