The M910A Vertical Foregrip WeaponLight attaches to Picatinny rail interface-equipped weapons via an integral dual thumbscrew mount. The 1.62" head diameter provides the perfect balance between size, weight, and beam configuration. Powered by three 123A lithium batteries inside the grip. Each unit is equipped with five separate switches: (1) two momentary-on pressure pads to activate the main light -- one on each side of the grip for ambidextrous operation (2) a rotary constant-on switch for the main light (3) a system disable switch to shut down the entire unit for storage, transport, or to prevent accidental activation during a stealth approach, and (4) a momentary-on thumb switch to control two low-output RED LEDs used in stealth navigation.

The optional KT4 conversion kit permits replacing the M900A's 1.62" diameter head with a 2.5" diameter head that produces a narrower but farther-reaching beam.