The SureFire M900A attaches by means of an integral throw-lever clamp to long guns equipped with a Picatinny rail on the underside of the forend. This WeaponLight produces a brilliant beam configured for close- to medium-range applications and also features two low-output navigation lights available in white, red, or blue. Primary beam output is 125 lumens for one-hour of runtime using an MN10 lamp assembly (included) or 225 lumens for 20 minutes using an MN11 lamp assembly (included).
The M900A has four primary beam switches: two momentary-on pressure pads to activate the main light (one on each side for ambidextrous operation), a constant-on rotary switch for the main light and a system-disable switch that locks all lights in the OFF position to prevent accidental activation during covert operations, transport, or storage. The navigation lights are operated by a momentary-on pressure pad thumb switch. The optional KT4 conversion kit replaces the standard 1.62" diameter head with a 2.5" diameter head that produces a more focused, extended-range beam.