The Arisaka 18350 Series Light Body is a shorter, streamlined replacement body for Surefire Scout Light M600DF weapon lights. This light body converts the light to use an 18350 cell instead of an 18650 cell, reducing the length by over an inch. The 18350 Series Light Body is manufactured without the mounting interface for the stock Picatinny clamp. This greatly increases the clearance for front sights when used in combination with the Arisaka Inline Scout Mount on handguards with 45 degree mounting surfaces adjacent to the top Picatinny rail. It will also fit in any aftermarket Scout mount, as it retains the mounting holes and square lug interface on the underside of the light body.Features :Weight: 0.6 ozHardware: One #19 o-ring, one #15 o-ringMade in the USA