Holosun LS321G Coaxial Green, IR and Illuminator Laser Sight w/ QD Picatinny Rail Mount – LS321G. The Holosun LS321G is a 7075 Aluminum bodied multi- laser aiming device. Zeroing is easy with the coaxially mounted class IIIA visible red laser, class 2M IR laser, and IR Illuminator. With a quick release picatinny rail mount, a remote pressure switch and IP67 water resistance level, this coaxial multi-laser is the perfect addition to any rifle or PDW. Features of the Holosun LS321G. Coaxial Dual Laser & IR Illuminator. 3.6″×2.2″×1.6.