The Holosun Laser & Weaponlights is a class IIIa visible red laser aiming device with a coaxial mounted class 2 IR (infrared) laser and IR illuminator for use with night vision devices. The LS321R features a 7075-aluminum matte black anodized housing with a quick release Picatinny rail mount. The LS321R is powered by a single CR123 battery which can provide up to 5000 hours of battery life.

The rear facing selector switch lets the user select between visible low, visible high, IR high, IR illuminator, or IR high with IR illuminator activation using the included remote pressure switch or turn the unit OFF. The LS321R also includes a top mounted activation button and tactile windage and elevation adjustments for a precision zero.